The assigned combatant’s Attack is increased by 8(16)%.
When the assigned Combatant’s card Moves from Graveyard to hand, gain 1 Repairs Complete.
Repairs Complete: +10(20)% Damage to Attack Cards of this unit during this battle (max 3 stacks)
Increase Damage of the assigned Combatant’s Attack Cards that are used against Ravaged targets by 15(30)%.
Overclock Beacon(3 EP):
When an ally inflicts Ravage, 1Overclock to the assigned Combatant. (1 time per turn)
Overclock: +25% Critical Chance for 1 turn
Peko aligns almost perfectly with Sereniel’s kit. Homing Lasers returning from the Graveyard to hand reliably stack Repairs Complete!, granting up to +30% Attack Card Damage that persists for the entire battle. This is generic damage, which fully benefits Sereniel’s repeated zero-cost lasers, Ravage windows, and Tenacity pressure. On top of that, Peko adds +15% damage vs Ravaged targets, directly amplifying Sereniel’s core loop, and provides conditional Overclock (+25% crit chance) during Ravage turns. This combination delivers the highest sustained and burst DPS across a fight.
2) 3★ Yuri (ME4)
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The assigned combatant's Attack is increased by 8(16)%.
Upon the first shuffle, the assigned combatant's damage dealt is increased by 8(16)%.
Drone Deployment!(3 EP):
Draw 2.
Yuri provides a large +16% Attack multiplier and an additional +16% damage after the first shuffle, but Sereniel need assistance in card cycling for earlier activation of the damage buff. While Attack scaling is weaker than flat damage in Sereniel’s late-game loop, the buff applies universally and permanently once active. Yuri lacks Ravage-specific bonuses and does not scale off laser returns, but its consistency and simplicity make it a strong second choice, especially in longer fights.
3) 5★ Serithea (ME0)
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The Critical Chance of the combatant's attack cards increases by 8(16)%.
When the assigned combatant's attack results in a Critical Hit, +3(5)% Critical Damage. Stacks up to 5 times.
Crimson Romance(3 EP):
Deal250% Damage. Apply 2 Vulnerable.
Despite offering crit-focused bonuses, Serithea underperforms for Sereniel at ~60% crit chance. The +8% crit chance is marginal, and the stacking +15% crit damage translates to only ~9% effective damage on average — clearly inferior to flat damage bonuses. The Vulnerable from her Ego skill is useful but one-time, and her scaling does not synergize with Sereniel’s Graveyard-to-hand loops or Ravage cadence. Serithea only becomes competitive at near-100% crit builds, which Sereniel does not naturally reach.