Rubea Stiria

Grand Weapons [Grand Weapons] Rubea Stiria Can be uncapped to 4★

02	HP	ATK	C.A.×
Level 1	39	473	400%
Level 100	225	2885	450%
Level 150	272	3488	500%
Obtain	Flash Gala
Character UnlockObtaining this weapon unlocks a character. Drawing additional copies beyond the first will instead earn a Gold Moon.	Yatima

Unlock Uncap
4★	Complete Yatima Lvl 45 Fate Episode "Once in a Blue Moon"

ID	1040713800
JP Name	ルベウス・スティーリア
Release Date	2024-12-28
4★ Date	2024-12-28
Other Sites	gbf-wiki (Japanese wiki)GameWithKamigameHuiji Wiki (Chinese wiki)

The incident occurred during the team's analysis of the firearm's frame. What is believed to be the muzzle spontaneously engaged in response to the voice of Researcher A. Shortly thereafter, the crystal spines discharged in all directions, killing [redacted] personnel. We theorize that the weapon reacted in self-defense via an unknown internal mechanism, and it may have entered its current dormant state upon sensing the cessation of all vital signs in its vicinity. Repeat activations are highly probable. (Excerpt from a lost Society report)

Charge Attack
	Reflection Ray	Massive Water damage to a foe. All Water allies gain Bonus Water DMGDeals bonus water DMG for one-foe one-ally attacks Duration: 3.5 turnsApplied during the attack phase. On the next turn, it'll have 3 turns remaining.. Additional effect at 4★: All Water allies also gain DA UpDouble attack rate is boosted and TA UpTriple attack rate is boosted .

Weapon Skills
	Optimus Exalto Aquae	30% boost to Water's, Tsunami's, and Hoarfrost's weapon skills
	Water's Celere	Small boost to water allies' ATK and critical hit rate
▶ 150	Unlocks at level 150:	Unlocks at level 150:
	Hoarfrost's Stratagem	Big amplifying boost to water allies' critical hit DMG

4★ Uncap
300×  Bow Stone   20×  Gray Sandstone     6×  Gabriel Anima     5×  Blue Sky Crystal	200×  Water Quartz     3×  Water Urn     2×  Legendary Merit
Rupies ×100,000

Base Reduction Materials
200×  Bow Stone   30×  Tidal Whorl	30×  Frost Orb
This weapon should not be reduced or used as fodder.

Water Grand Weapons

Gameplay Notes

Optimus Exalto Aquae

• Boost stacks additively up to 90% when equipping multiple copies.

Hoarfrost's Stratagem

• Boost stacks up to 20% when equipping multiple copies.

Skill Level	Critical Amplify
1	0.5%
10	1.4%
15	1.8%

Aura Boost	Selection
Base Weapon Skill Value (%):
Exalto Type:	Omega Optimus
Exalto Omega:	None 20% 40% 60% 80% 100%
Exalto Optimus:	None 30% 60% 90%
Main Summon:	None 140% 150% 160% 170%
Support Summon:	None 140% 150% 160% 170%
Sub Summon:	None 10% 20% 40%
Character Passive:	None 10% 20% 30%
Total Aura Boost: 0.00%
Total Weapon Skill Value: 0.00 (%)
Reset

Bonus DMG Stacking Information

• The following is a curated list of how different Bonus DMG sources interact with Rubea Stiria's skills. Check Bonus DMG for further information and a comprehensive list.

Reflection RayMassive Water damage to a foe. All Water allies gain Bonus Water DMGDeals bonus water DMG for one-foe one-ally attacks Duration: 3.5 turnsApplied during the attack phase. On the next turn, it'll have 3 turns remaining.. After 4★: All Water allies also gain DA UpDouble attack rate is boosted and TA UpTriple attack rate is boosted . - Charge Attack
Bonus Damage Side	Sources	Stacking
Skill A	Cagliostro (Summer) -  Ars NovaArs Nova: All Water allies gain 70% / 30% Critical Hit Rate UpAttacks made with elemental superiority have a chance to deal boosted DMG Strength: 70% chance of dealing 30% more damage.Duration: 3 turns, KeenSupplemental DMG to critical hits Strength: 1% of foe's max HP (Damage cap: 50,000)Duration: 3 turns, and 1 Deluge CrestWater magic is amplified (Max: 5 / Can't be removed) Duration: Indefinite. (When Cagliostro's Deluge CrestWater magic is amplified (Max: 5 / Can't be removed) Duration: Indefinite is 5: Skill changes to Ars Notoria.) Ars Notoria: All Water allies gain 100% / 30% Critical Hit Rate UpAttacks made with elemental superiority have a chance to deal boosted DMG Strength: 100% chance of dealing 30% more damage.Duration: 3 turns, KeenSupplemental DMG to critical hits Strength: 1% of foe's max HP (Damage cap: 50,000)Duration: 3 turns, 50% Bonus Water DMGDeals bonus water DMG for one-foe one-ally attacks Strength: 50%Duration: 3 turns, and 15% DMG Cap UpMaximum amount of DMG that can be dealt per hit is boosted Strength: 15%Duration: 3 turns. Jeanne d'Arc (Water Summer) -  ConfrontSacrifice 80% of caster's current HP. All Water allies gain JammedATK is greatly boosted based on how low HP is Strength: 30%-90%Duration: 5 turns. (Based on DesireBased on lvl: Bonus Water DMG effect / DMG and DMG cap for normal attacks and counterattacks are boosted (Max: Lvl 5 / Can't be removed) lvl: All Water allies also gain Bonus Water DMGDeals bonus water DMG for one-foe one-ally attacks Duration: 3 turns and Water ATK UpWater ATK is boosted Duration: 3 turns.) Lucio (Summer) -  RevelationAll allies gain 20% Bonus Water DMGDeals bonus water DMG for one-foe one-ally attacks Strength: 20%Duration: 3 turns and Charge Bar +20%Instantly boosts Charge Bar by 20% Strength: 20%. Societte -  First Dance: KaguraRestore 30% of all allies' HP (Healing cap: 2000). All allies gain RevitalizeRecover HP each turn. Boost to charge bar if HP is full. Strength: 500 HP or 10% charge barDuration: 3 turns and 10% Bonus Water DMGDeals bonus water DMG for one-foe one-ally attacks Strength: 10%Duration: 3 turns. (When a foe uses a special attack: Consumes Yonagi RiteFirst Dance: Kagura activates when a foe uses a special attack (Can't be removed) to auto-activate.) Tefnut (Summer) -  IstiraahahGain Convalescent DozeCan't normal attack / Sharp boost to dodge rate / Upon charge attack: Double Strike effect and Bonus Water DMG effect to the water ally in the next position / At end of turn: Tefeng Sayf activates (Can't be removed) Duration: 5 turns. Bow of Sigurd Militis -  Sephira Legio AquaeWhen main weapon (MC only): Starts battle with 30% Bonus Water DMGDeals bonus water DMG for one-foe one-ally attacks Strength: 30%Duration: 1 turn . (In ArcarumArcarum: The World Beyond Replicard Sandbox: Active even when not main weapon and affects Water allies.)	✓
Skill B	Catura (Holiday) -  Honeyed WordsCaster and Water MC gain 40% Bonus Water DMGDeals bonus water DMG for one-foe one-ally attacks Strength: 40%Duration: 4 turns. (From 2nd cast: Caster and Water MC also gain 100% / 30% ArmoredChance of lowering DMG taken Strength: 100% chance of taking 30% less damage.Duration: 4 turns. From 3rd cast: Caster and Water MC also gain 100% Debuff Res. UpDebuff resistance is boosted Strength: 100%Duration: 4 turns.) Lucio (Summer) -  Without YouGrant a Water ally 90% Bonus Water DMGDeals bonus water DMG for one-foe one-ally attacks Strength: 90%Duration: 2 turns, Guaranteed TAGuaranteed triple attack regardless of Triple Attack Lowered debuffs Duration: 2 turns, 70% Fire CutFire DMG is cut 70% Duration: 2 turnsFire Damage Cut., and 100% Debuff Res. UpDebuff resistance is boosted Strength: 100%Duration: 2 turns.	✓
Skill C	Juliet (Water) -  Fulmine AzzurroAll Water allies gain 1 Deluge CrestWater magic is amplified (Max: 5 / Can't be removed) Duration: Indefinite, Mirror Image (1 time)Next one-to-one attack received will be ineffective (Effect removed on next all-foe all-ally attack) Duration: Indefinite, and 20% Bonus Water DMGDeals bonus water DMG for one-foe one-ally attacks (Ends upon taking DMG) Strength: 20%Duration: Indefinite. (Bonus Water DMG effect ends upon taking damage.)	✓
Skill D	Clarisse (Summer) -  Garibaldi LinkCaster and Water MC gain 100% TA Up (1 time)Triple attack rate is boosted (1 time) Strength: 100%Duration: Indefinite and 80% Bonus Water DMG (1 time)Deals bonus water DMG for normal attacks (1 time) Strength: 80%Duration: Indefinite. Vikala (Halloween) -  The Night's Only Just Begun!When the field effect Spooky UtopiaFoes' ATK is boosted / Water allies' dodge rate is boosted Field effect Local status effect is active: Supplement Water allies' skill damage (Damage cap: 50,000). All Water allies gain 10% Bonus Water DMG (1 time)Deals bonus water DMG for normal attacks (1 time) Strength: 10%Duration: Indefinite at the start of the turn's attack.	✓
Skill E		✓
Skill Unique	Gabriel -  Kitrino NimaAll Water allies gain 70% Fire CutFire DMG is cut 70% Duration: 2 turnsFire Damage Cut. and Glacies WardBonus Water DMG effect / Cap fire DMG taken at 10,000 per hit / DEF and triple attack rate are boosted (Can't be removed / Ends upon taking DMG 3 times) Duration: Indefinite. (Glacies Ward ends upon taking damage 3 times.) Haaselia -  Phases of the MoonAll Water allies gain 20% Water ATK UpWater ATK is boosted Strength: 20%Duration: 2 turns, Tears of LunacyBoost to ATK specs based on the moon phase Duration: 2 turns, and Charge Bar +15%Instantly boosts Charge Bar by 15% Strength: 15%. Moon waxes. (Progresses the current moon phase on all allies by 1 turn.)	✓
Self Element A	MC skills that grant Bonus DMGDeals bonus DMG for one-foe one-ally attacks Ullikummi -  Vogue Hymn IIWhen main weapon (MC only): 1-turn cooldown cut to all skills with over 5-turn cooldown. All allies gain 30% Bonus DMGDeals bonus DMG for one-foe one-ally attacks Strength: 30%Duration: 3 turns and a random buff when using first ability.	✓
Self Element D	MC skills that grant Bonus DMG (1 time)Deals bonus DMG for normal attacks (1 time)	✓
Superior Element A	Anila (Summer) -  Puffy Summer TowersGrant an ally 30% Bonus Superior Elemental DMGDeals bonus superior element DMG for one-foe one-ally attacks Strength: 30%Duration: 3 turns and Dodge All (1 time)Takes no DMG or debuffs while in effect for a set period Duration: Indefinite. Anila (Yukata) -  The Big Summer Stage!Normal attacks deal 2-hit damage to random foes. At end of turn when allies deal damage 20 or more times to the current target in 1 turn: All allies gain 10% Bonus Superior Elemental DMGDeals bonus superior element DMG for one-foe one-ally attacks Strength: 10%Duration: 1 turn . Raise Anila's Ewe-phoriaGains effects in order based on Ewe-phoria lvl: Deal multiattacks / Boost to ATK / Amplify normal attack DMG / Boost to DMG cap / Buffs can't be removed (Max: 5 / Can't be removed) Duration: Indefinite lvl by 1 (Max: 5). Korwa (Water) -  Cloche NuptialeGrant a Water ally C'est BelleWater ATK is boosted (Can't be removed) Strength: 50%Duration: IndefiniteStacking: Special Buff, Piercing SightElemental DMG dealt will be treated as superior to the target's element Duration: 3 turns, 15% DMG Cap UpMaximum amount of DMG that can be dealt per hit is boosted Strength: 15%Duration: 3 turns, and 20% Bonus Superior Elemental DMGDeals bonus superior element DMG for one-foe one-ally attacks Strength: 20%Duration: 3 turns. (Consumes 3 FilMagically infused thread. Consumed upon using Korwa's skills (Can't be removed) .)	✓
Superior Element B	Narmaya (Valentine) -  Butter FlutterFor my sweet captain: MC gains 20% Bonus Superior Elemental DMGDeals bonus superior element DMG for one-foe one-ally attacks Strength: 20%Duration: 5 turns and 50% DA UpDouble attack rate is boosted Strength: 50%Duration: 5 turns. When Together ForeverNext Butter Flutter also affects Narmaya Duration: Indefinite is consumed: Narmaya also gains Butter FlutterDeals bonus superior elemental DMG for one-foe one-ally attacks Strength: 20%Duration: 5 turns and DA UpDouble attack rate is boosted Duration: 5 turns.	✓
Superior Ele. Unique		✓
Charge Attack	Diantha (Summer) -  Idol on the BeachRestore 10% of all allies' HP (Healing cap: 2500). All allies gain 10% Bonus Water DMGDeals bonus water DMG for one-foe one-ally attacks Strength: 10%Duration: 5.5 turnsApplied during the attack phase. On the next turn, it'll have 5 turns remaining. and Tlepilli GlowATK and multiattack rate are boosted (Can't be removed) Strength: 30% ATK Up / 50% DA Up / 25% TA UpMultiplier: NormalDuration: 5.5 turnsStacking: Special BuffApplied during the attack phase. On the next turn, it'll have 5 turns remaining.. Diantha gains Dodge All (1 time)Takes no DMG or debuffs while in effect for a set period Duration: Indefinite. Feower -  Mors Certa550%Massive Water damage to a foe (Damage cap: ~2,300,000). Inflict DelayReduce a foe's filled charge diamonds by 1 Base Accuracy: 100%. All allies gain 35% DA UpDouble attack rate is boosted Strength: 35%Duration: 2.5 turnsApplied during the attack phase. On the next turn, it'll have 2 turns remaining., 35% TA UpTriple attack rate is boosted Strength: 35%Duration: 2.5 turnsApplied during the attack phase. On the next turn, it'll have 2 turns remaining., and 10% Bonus Water DMGDeals bonus water DMG for one-foe one-ally attacks Strength: 10%Duration: 3.5 turnsApplied during the attack phase. On the next turn, it'll have 3 turns remaining.. Sandalphon (Summer) -  Ain Soph AurMassive Water damage to a foe. Inflict Bell of WarBoost to Sandalphon's C.A. DMG and C.A. DMG cap based on effect level (Max: 2 levels) Base Accuracy: 100%Local status effect. Consume 1 Coffee BreakGranted coffee breaks (Max: 5 / Can't be removed) Duration: Indefinite: All allies also gain 10% Bonus Water DMGDeals bonus water DMG for one-foe one-ally attacks Strength: 10%Duration: 3.5 turnsApplied during the attack phase. On the next turn, it'll have 3 turns remaining.. Fateless -  Frigid StingMassive Water damage to a foe. Remove 1 buff. After 4★: All allies also gain 15% Bonus Water DMGDeals bonus water DMG for one-foe one-ally attacks Strength: 15%Duration: 3.5 turnsApplied during the attack phase. On the next turn, it'll have 3 turns remaining.. Worldstorming Aetos -  Eau de l'AigleMassive Water damage to a foe. All allies gain 15% Bonus Water DMGDeals bonus water DMG for one-foe one-ally attacks Strength: 15%Duration: 1.5 turnsApplied during the attack phase. On the next turn, it'll have 1 turn remaining..	✖
Summon	CharybdisAbysmal Waters 500% Water damage to all foes (Damage cap: ~630,000). All Water allies gain 20% Bonus Water DMGDeals bonus water DMG for one-foe one-ally attacks Strength: 20%Duration: 1 turn , 40% DA UpDouble attack rate is boosted Strength: 40%Duration: 1 turn , and 20% TA UpTriple attack rate is boosted Strength: 20%Duration: 1 turn .  Frost Lord's ArmyRelentless Advance Massive Water damage to all foes. All Water allies gain 10% Bonus Water DMGDeals bonus water DMG for one-foe one-ally attacks Strength: 10%Duration: 2 turns for 2 turns.	✓
Self Element Summon	Belial (Summer)Hotter than the Sun 400% Elemental damage to all foes (Damage cap: ~1,120,000). All allies gain 3 random buffs. MC gains Cunning CharmLands the following on all allies in 3 turn(s): Charm effect / Sharp hit to DEF / Debuff Resistance Lowered effect (Can't be removed) Duration: 3 turns. (Inflict CharmedAttacks are slightly limited (Can't be removed) Duration: 3 turns, 70% Sharp DEF DownDEF is sharply lowered (Can't be removed) Strength: 70%Duration: 3 turns, and 100% Debuff Res. DownDebuff resistance is lowered (Can't be removed) Strength: 100%Duration: 3 turns on all allies when duration ends.)	✓
Passive A	Chain of Falsehood - Deceitful FallacyBonus Elemental DMG effect / Sharp hit to charge bar gain Damascus Knife -  Elemental Hunt10% Bonus elemental DMG effect to weapon elementi.e., the same element as the weapon. allies against foes with BountyItem drop rate is boosted . Sky Piercer -  Elemental Blow20% Bonus weapon elementi.e., the same element as the weapon. DMG effect to third hit of elemental allies' triple attacks. Cagliostro (Summer) -  Foundation of Cuteness10% Bonus Water DMG effect to Water allies' critical hits on normal attacks. Haaselia -  Lunar ReflectionBonus Water DMG effect to Water allies based on the moon phase. Maria Theresa -  The Empress UprightWhen Switching to Main Ally: All Water allies gain Righteous IndignationBoost to DMG dealt against foes with Unrighteousness effect / Deals bonus water DMG for one-foe attacks against foes with Unrighteousness effect (Can't be removed) Strength: 20% ATK Up / 20% Bonus Water DMGMultiplier: PerpetuityDuration: Indefinite. (Can't be reactivated.) At level 95: Set Water allies' HP to full and remove all debuffs. All Water allies also gain Devotion to JusticeCritical hit rate, DEF, multiattack rate, and DMG cap are boosted (Can't be removed) Duration: 5 turns. (Can't be reactivated.) Arvess Demiclone -  Ocean Blue Blow20% Bonus Water DMG effect to third hit of Water allies' triple attacks. Hraesvelgr -  EinarWhen main weapon: 80% Bonus Water DMG effect to Water allies' single attacks. Xuanwu Shellfists -  Hoarfrost's Fourth PursuitBonus Water DMG effect to fourth-positioned water ally / 30% hit to charge bar gain	✓
Passive B	Zeta (Water) -  Arvess ResonanceGuaranteed triple attacks. 20% hit to charge bar gain. 10% Bonus Water DMG effect to Water allies' triple attacks.	✓
Passive Unique	Yatima -  The Centuries We've SharedRaise Alpha ModBased on lvl: Critical hit rate is boosted / Deals bonus superior elemental DMG upon normal attacks (Max: 4 / Can't be removed) Duration: Indefinite lvl by 1 for every 15 hits dealt by Yatima (Max: 4). Raise Delta ModBased on lvl: DMG taken is reduced / Debuff resistance is boosted (Max: 4 / Can't be removed) Duration: Indefinite lvl by 1 upon being targeted by a foe (Max: 4). (Based on Alpha ModBased on lvl: Critical hit rate is boosted / Deals bonus superior elemental DMG upon normal attacks (Max: 4 / Can't be removed) lvl: Boost to critical hit rate and Bonus Superior Elemental DMG effect. Based on Delta ModBased on lvl: DMG taken is reduced / Debuff resistance is boosted (Max: 4 / Can't be removed) lvl: Damage reduction and boost to debuff resistance.)	✓

Trivia

Etymology

• "Rubea Stiria" is Latin for "Red Icicle."
  • Rubeus is the Latin word for "red." As an example, Rubeus Centrum is another Granblue item that uses this word (in the English translation). While the Japanese uses the masculine form "rubeus," this was corrected in the English translation to match the feminine "stiria"
  • Stiria is Latin for "icicle."

Resources

• Reddit Weapon Discussion (2025-01-08)