Regressor

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

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, thereby allowing them to make certain changes in their existing loop in order to alter the timeline.

The user will presumably only have three total attempts of looping through the use of this skill. If the user is slain in the final loop, then their existence is erased forever.

Trivia

 * Clayman gained this Unique Skill immediately after his death in the Walpurgis Banquet in the spin-off Clayman Revenge.
 * It is unknown if this skill can work if the user dies physically but is alive spiritually, as Deathmen can escape their physical demise by seperating their Astral Body. It can be assumed that by the user's death, they mean by their complete demise, both physically and spiritually.