Summon Board Passive selections:
Numbers listed below refer to the 7 passives to select for each Ultimate Summon Board for the character. Top is 1, bottom is 7.Odin choose 3 / 6 / 7
Bahamut choose 3 / 4 / 6
Usuals:
Ifrit, Shiva, Ramuh, Brothers 4 / 5 / 7
Leviathan, Pandemonium, Diabolos, Alexander 4 / 5 / 6
For more details and help with summons, check Summon Hub!
Vayne is a mostly melee attacker (magic EX) that can frequently inflict breaks, frequently buffs, and does not debuff at all... wtf is that E slot...
A Sphere - Prioritize ATK & BRV DMG, plenty of options, click the link to see our sphere hub. Breaking conditions are harder for other units while Vayne has no issue breaking (peoples' wills).
D Sphere - Boost the party's ATK (probably not Wakka tho)
E Sphere - Give him some utility with Vanille. No debuffs, no Yuffie >:C
TLDR: Vayne uses many turns in a row so he can very easily blow through buffs and his own BT aura. The + versions of his attacks are all free skill uses and free & instant turn (besides LD) however they do not increase stacks or duration of Conqueror’s Power. If using Vayne’s BT, he is best paired with a turn hog to take advantage of his strong follow up from his BT Aura.
Conqueror’s Power is Vayne’s signature buff. This provides a small buff in stats for him and the party but more importantly at 3 stacks gives Vayne his + skills. Using his + skills allows Vayne to take multiple turns in a row to deal solid damage.
Mach Wave is a simple attack that increases his Conqueror’s Power stacks by 2.
Force of Will is a stronger attack that also unBreaks the opponent after the first HP attack allowing for a single target delay. Force of Will also increases Conqueror’s Power by 1 stack and gives Vayne his Consul’s Ingenuity buff. This is also his favorite move while his Force Time is active.
Tree of Sephira unBreaks all enemies before attacking, allowing Vayne to delay all enemies. It also maxes his stacks of Conqueror’s Power and refunds 1 use of Mach Wave and Force of Will. Do not use + version of Tree of Sephira unless BT effect is active. Tree of Sephira should be used to maximize his stacks of Conqueror’s Power and being + means you are gaining nothing.
Contempt is a very strong BRV shaver that gives Vayne max stacks of Conqueror’s Power and his Contempt buff. Contempt provides numerous important stat buffs to Vayne and the party.
Gigaflare Sword’s Burst Aura provides decent stat buffs to the party but also gives Vayne a very strong follow up on all party attacks for 10T, dramatically increasing Vayne’s damage over time.
Vayne's follow-up won't trigger from breaks inflicted by traps, counters and is once per attack
Godslaughter is his FR and along with it's damage, it immediately sets him up to take multiple turns in a row with his Conqueror's Power buff and an instant turn from the FR itself.
His strongest allies are linked attackers and supports. Cor, Yang and some other Melee Linked attackers go especially well with Vayne if you add Sephiroth BT+ effect to allow for easier breaks for non-Vayne allies.
Ignoring allies, to setup his FR phase you want to:
BT finisher -> FR -> S2 -> S2 -> LD -> S2 -> S2 -> S2 -> S2 -> LD -> FR -> BT finisher (Conqueror's Power won't tick down)
Lunafreya's LDCA or Quick Prayer from a party member can make the BT finisher -> FR part really easy
You can also opt to forego the LD before BT phase to allow 1T after BT finisher with a high FR HP DMG Bonus for a big call/Level 50 Summon later.
With Sephiroth BT effect up, you can opt to use S1 instead of S2 on multi-target fights for the extra splash damage!