Regressor

Regressor (生還者) is the Unique Skill awakened by Clayman while being killed by Rimuru Tempest in the Clayman Revenge Spinoff.

Abilities
In the event of the death of the individual wielding this Skill, the user is sent to a certain point of time in the past with the memories of their time before their death. In other words, the user is in a time loop, where after each demise they are sent to the same point from where the loop began. The user, however, keeps all the memories of their past loops intact, allowing them to alter the timeline of events

The user has a grand total of three lives, displayed at all times with a 3/3 symbol in the corner of their vision. It is made unclear if this considers the first loop where they obtained the ability as one of the lives.