Understand Something Irreplaceable
Useful when…
- A Destruction damage dealer who is sometimes hit or defeats enemies during combat.
- A wearer who can make use of both the ATK increase and conditional self-healing.
What happens when it triggers?
At S1, the wearer gains 24% ATK. When they are hit or defeat an enemy, they immediately restore HP equal to 8% of their ATK and gain 24% damage until the end of their next turn. The effect cannot stack and can trigger only once per turn. S5 raises the ATK and damage bonuses to 40% and the healing fraction to 12%.
Who can use it, and what differs among alternatives?
It combines an always-on ATK increase with a conditional survival and damage effect, so the recovery is useful only if a hit or defeat occurs and the wearer needs healing. A Secret Vow grants damage, with an additional bonus against enemies whose current HP percentage is at least the wearer's. A Trail of Bygone Blood supplies CRIT Rate and boosts Skill and Ultimate damage. A Thankless Coronation instead offers CRIT DMG and an Ultimate-linked ATK and Energy effect with a 300 Max Energy condition. These are distinct damage profiles, not guaranteed replacements.
How should you invest?
Promotion takes the Light Cone through six stages and raises base stats. Superimposition improves the ATK, healing fraction, and damage bonus; the shown steps consume one duplicate copy each. Favor promotion for basic progression, and reserve copy-consuming refinement for a wearer who benefits from the passive often enough to justify it.
Limitations and tradeoffs
- Healing requires the wearer to be hit or defeat an enemy.
- The trigger is limited to once per turn and its damage bonus does not stack.
- Superimposition consumes duplicate copies.
Common mistakes to avoid
- Do not expect the wearer to heal every time they are hit; the effect is limited to one trigger per turn.
- Do not assume the damage bonus stacks when multiple trigger conditions occur.