: After reaching a threshold (e.g., 5 stacks), the player can consume the stacks to unleash a Secondary Echo . ⚔️ Combat Effects

: You or an ally within 30 feet reduces an enemy to 0 HP.

: A translucent, pulsing ring on the ground that changes color (from soft blue to fiery orange) as stacks increase.

If you are using this in a TTRPG like Pathfinder 2e , you could implement this as a feature: Action Cost : 1 Reaction.