Something Irreplaceable is a 5 star The Destruction Light Cones.

Kinship

Increases the wearer’s ATK by 20%/25%/30%/35%/40%. When the wearer defeats an enemy or is hit, immediately restores HP equal to 6%/7.5%/9%/10.5%/12% of the wearer’s ATK. At the same time, the wearer’s DMG increases by 20%/25%/30%/35%/40% until the end of their next turn. This effect cannot stack and can only trigger 1 time per turn.