Jack

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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 4 / 6 / 7
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!

NOTE: The sphere letters below are hyperlinked to our Sphere Hub which lists all available spheres sorted by effect!

Open with Jack’s EX, into a free skill (read further below for considerations), then use Piercing Gleam. You’ll want to maintain Katana Wounds on enemies as long as you can, as the debilitating debuff will enable premium BRV damage from your party. This can generally be easily maintained for the entire fight.
Anytime Deliverance triggers, Jack’s next turn will move up to be in front of the enemy, unless his next turn was sooner. Note the enemy must be breakable which is not always the case with mBRV floor fights seen in Safer Sephiroth, Divine Bahamut, Brothers Spiritus, etc.
Ninja Slice is his go-to single target BRV shaver and will always trigger Deliverance if the target is broken after the attack.
Same thing goes for Lightning Flash, but it’s his primary AoE attack instead
Soul Harvest is powerful, giving Jack 100% evasion for a turn to offset the fact that his HP is lowered to 1. Be careful of guaranteed hits, if enemies have them, you’re probably going to need a tank or some kind of mitigation to protect him.
The recharge is too wonky to estimate. Without turn jumping, it would normally be 2 skill uses, but in practice it’s more like 3 potentially.
The free ability use is best spent on Ninja Slice (it has 100% crit rate if the enemy is not targeting him), but if you need to shave AoE, opt for Lightning Flash.

Jack’s LD call is one of the absolute best for enabling BRV DMG in the game. Use it when you are ready to go ham (friend unit, BT phase, summon, etc). Be mindful if enemies cleanse their debuffs! Note however, there are more units that rely less and less on BRV DMG and enabling HP DMG through call effect, call debuffs, etc are usually more valuable unless a fight has enormous DEF that needs Generics + Jack LDCA.
HP DMG up is excellent for him, you can check our staple roles here!