Perfect Memory

Perfect Memory (完全記憶) is an Intrinsic Skill or Extra Skill that was gifted to the citizens of Tempest who were revived following the invasion by the Kingdom of Falmuth as part of their evolutionary process. Rimuru had also obtained it through the "Food Chain" of his Ultimate Skill Beelzebuth.

Effects
It allows the user to record their memories into their Astral Body. It lets the user retain their memories for as long as the Soul remains intact. Even if the physical body was completely vaporized, it could rebuild those memories from the state of death an infinite number of times. It also makes the user immune to all attempts to control their mind and spirit.