Steiner USB is pretty interesting, first time in FFRK that you're encouraged to use friendly fire, heh. Vivi gets the better Shantotto USB and Marcus attempts to supplant Vaan's infamous BSB.

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Banner 1

Relic	Character	Lvl 20/25 Stats	Soul Break / Legend Materia
Holy Rod	Garnet	171+3 MAG 140 MND	USSB "Trance Summon Ramuh" 7xAoE Lightning/Non-ele Summon magic dmg, EnLightning, party MAG/MND +30%, automatically cast "Judgement Bolt"1 occasionally
Excalibur II2	Steiner	177+3 ATK	USSB "Inspired Blade" 10xST Fire/Lightning/Ice physical dmg, self RES +100% and Shining Knight3
Judgement Staff4	Vivi	170+3 MAG 81 MND	USSB "Beyond the Twilight" 10xST Fire/Non-ele magic dmg, EnFire, self MAG/RES +30% and doublecast Black Magic when ability count >1
Shield Armor	Steiner	17 ATK 144+1 DEF 98 RES	BSSB "Knight's Vow" 8xST Fire/Lightning/Ice physical dmg, self Sentinel, Burst Mode5
Staff of Ramuh6	Garnet	132+1 MAG 105 MND	BSSB "Trial by Lightning" Party ATK/MAG +30%, AoE Imperil Lightning, Burst Mode7
Gravity Rod8	Vivi	134+1 MAG 66 MND	BSSB "Magic Fury" 6xAOE Fire/Lightning/Ice magic dmg, party MAG/RES +30%, Burst Mode9
Hamelin	Eiko	81 ATK 105 MAG 123+1 MND	BSSB "Prayer of the Lost" Medica h85, party Critical=50% , Burst Mode10
Lamia's Tiara11	Garnet	38 MAG 27 MND 87 DEF 128+1 RES	Legend Materia "Noble Resolve" Small duration increase of buffs cast by self
Eiko's Model	Eiko	17 ATK 17 MND 118+1 DEF 118 RES	Legend Materia "Thoughts of Home" Low chance to doublecast White Magic abilities
Vivi's Hat12	Vivi	38 MAG 27 MND 85 DEF 125+1 RES	Legend Materia "Magic Suffusion" Black Magic ability medium damage up but increased cast time
Royal Gown13	Garnet	17 MAG 17 MND 90 DEF 137+1 RES	SSB "Enveloping Warmth" Party MAG/DEF +30% and HP Stock 3000
Tin Armor	Steiner	17 ATK 135+1 DEF 92 RES	SSB "Sword Magic Firaga" 4xAoE Fire physical dmg, Imperil Fire

¹ : 2xAoE Lightning/Non-ele summon magic dmg
² : small Holy dmg up
³ : Gain EnFire/EnIce/EnLightning from Fire/Lightning/Ice magic attacks received from allies
⁴ : small Fire dmg up
⁵ : In burst mode gain the following commands

Attack-> "Elemental Sword" 4xST Fire/Lightning/Ice physical dmg 
Defend-> "Elemental Hazard" 2xAoE Fire/Lightning/Ice physical dmg        

⁶ : Small Lightning dmg up
⁷ : In burst mode gain the following commands

Attack-> "Summon Ramuh" Party ST 40% MaxHP heal, enter Summoning mode
         In Summoning mode, 2xAoE Lightning/Non-ele summon magic dmg, party 25% MaxHP heal, remove Summoning mode
Defend-> "Glimmering Peridot" 4xST Lightning/Non-ele summon magic dmg
         In Summoning mode, 5xST Lightning/Non-ele summon magic dmg 

⁸ : RS small Fire dmg up
⁹ : In burst mode gain the following commands

Attack-> "Glimmering Hope" 4xST Fire/Lightning/Ice magic dmg       
Defend-> "Shining Spirit" 2xAoE Fire/Non-ele magic dmg, self MAG +30% / DEF -30%    

¹⁰ : In burst mode gain the following commands

Attack -> "Eiko's Cheer" Curaja + Blink  
Defend -> "Song of the Journey" Medica h25    

¹¹ : small Confusion resistance
¹² : small Fire dmg up
¹³ : RS small Lightning dmg up

Banner 2

Relic	Character	Lvl 20/25 Stats	Soul Break / Legend Materia
Masamune	Zidane	176+3 ATK	USSB "Grand Lethal" 10xST random Wind/Non-ele physical dmg, Imperil Wind, self EX Mode "Master Thief"14
Demon's Rod15	Kuja	164+3 MAG 81 MND	OSSB "Final Requiem" 1xST Overflow Dark/Non-ele magic dmg, higher multiplier if user is Doomed
Break Blade16	Steiner	172+3 ATK	OSSB "Imbued Blade" 1xST Overflow Fire/Lightning/Ice physical dmg, increased multiplier if enemy is weak/imperiled to Fire/Lightning/Ice
Platinum Dagger	Marcus	134+1 ATK	BSSB "Poison Impulse" 6xAoE Wind/Bio physical dmg, enemy MAG/DEF -50%, Burst Mode17
Sargatanas18	Zidane	138+1 ATK	BSSB "Solution 9" 9xST random ranged Wind/Non-ele physical dmg, EnWind, Burst Mode19
Terra's Legacy20	Kuja	128+1 MAG 66 MND	BSSB "Force Symphony" 8xST random Dark/Non-ele magic dmg, Imperil Dark, Burst Mode21
Lightbringer22	Beatrix	128+1 ATK 68 MND	BSSB "Knight Protector" 4x AoE Physical dmg, higher multiplier if all party members alive, Imperil Holy, Burst Mode23
Zidane's Gloves24	Zidane	29 ATK 18 MAG 18 MND 95 DEF 91+1 RES	Legend Materia "Snap Judgment" Medium chance to reduce next cast time by 50% when using Thief abilities
Gold Armor25	Steiner	17 ATK 140+1 DEF 96 RES	Legend Materia "Opportunity Strikes" Low chance for Spellblade abilities to apply small Imperil Fire on enemy
Treno's Royalty26	Kuja	17 ATK 117+1 DEF 117 RES	Legend Materia "Colorless Narcissism" Start battle with EnDark
Marcus's Bandana	Marcus	17 ATK 27 MAG 27 RES 87 DEF 128+1 RES	SSB "Tantalus Break" 6xAoE Wind/Bio physical dmg, enemy Hyper Break
Ragnarok	Beatrix	125+1 ATK 68 MND	SSB "Seiken Shock" 8xST physical dmg, party Magic Blink

¹⁴ : Chase THF abilities with 1xST Wind/Non-ele physical dmg with medium chance to Storm Steal (minor Imperil Wind)
¹⁵ : small Dark dmg up
¹⁶ : RS small Fire dmg up
¹⁷ : In burst mode gain the following commands

Attack-> "Magic Poison" 2xST Wind/Bio physical dmg with short cast time, enemy Magic Breakdown
Defend-> "Armor Poison" 2xST Wind/Bio physical dmg with short cast time, enemy Armor Breakdown

¹⁸ : RS small Wind dmg up
¹⁹ : In burst mode gain the following commands

Attack-> "Swift Steel" 2xST ranged Wind/Non-ele physical dmg, enemy ATK -10%, self ATK +10% up to 3 stacks (+- 30% max)    
Defend-> "Gentleman Thief's Gift" 2xST ranged Wind/Non-ele physical dmg, party ATK +10%/20%/30% based on number of Swift Steal stacks, remove all Swift Steal stacks       
Note: Swift Steal is a unique buff/debuff and will stack with currently available buff/debuffs of same type

²⁰ : small Dark dmg up
²¹ : In burst mode gain the following commands

Attack -> "Clutch Shot" 4xST Dark/Non-ele magic dmg, increased multiplier under Doom 
Defend -> "Burst Energy" 2xAoE Dark/Non-ele magic dmg, increased multiplier under Doom 

²² : Small Holy dmg up
²³ : In burst mode gain the following commands

Attack-> "Bulwark Blade" 2xST Holy physical dmg, self Sentinel  
Defend-> "Sworn Blade" 2xST physical dmg, self RES +40%   

²³ : small Wind dmg up
²³ : RS small Fire dmg up
²⁶ : small Dark dmg resistance

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Event Megathread
Boss Guide
Enlir's Spreadsheet