Heart Chain

This is a cursed technique in which the user is capable of “chaining” attacks and gaining attack and movement speed as well as damage multipliers by treating fighting as a rhythm game by attacking right as the users heart beats. The combo is broken if the user 1. Misses a beat 2. Hits at the wrong time Theoretically if the user got a high enough combo they could one shot any character but this is improbable because the effect only combos on living beings/cursed spirits Domain expansion: Vast Prison of the Heart This domain appears to be a dungeon with exactly 50 chains running up and down the ceiling and floor every time a hit is made to the beat of the users heart a chain breaks when a beat is missed a chain is added when there are no more chains the all beings in the domain excluding the user have their hearts exploded (or for cursed spirits they simply explode) in addition to this the standard domain sure-hit is added (this does not mean a combo is guaranteed) and your opponent must also also time their hits in accordance with their own heartbeat or suffer the consequence of having their attack reflected on themselves.

Let me know what you think! Is it too OP or underpowered or is it fine?