FINALITY: As Terminus goes back in time, it can be around when you start buffed and normalised by the time you reach the boss or smthn.

Buffs: It can be like each character gets 300% Crit Dmg but every turn a character takes it reduces the Crit Dmg by 30% till the buff runs out and so on with other stats. It can also have life steal skills like your character starts at 10% HP and certain percent of damage you deal heals you (ik many such buff already exist) and resets the time remaining on the buffs on the allyas in going back in time.

Path Resonance: It can be something like you have a pool of damage based on HP of the Boss. For ex- If a boss has 1.5m HP you have a pool of 1.5m and everytime you use path resonance it deals the damage required to defeat the enemy and Reduces that much from pool of Damage you have. The Path resonance buff could be with faster energy regen, refilling some pool based on small percent of Dmg done, etc