Infinity Prison

Infinity Prison (無限牢獄) is a Unique Skill originally belonging to Chloe Aubert.

Abilities
It entombs the target forever inside of an infinitely sized imaginary space and prevents any interaction between the inside and outside. It doesn’t seem to weaken over time and cannot be damaged via standard physical damage.

History
This Skill was used by Chloe to seal the Storm Dragon Veldora. The Infinity Prison remained active for about 300 years but was successfully dismantled thanks to the combined efforts of Veldora and Rimuru. Rimuru's Unique Skill Great Sage evolved into Ultimate Skill Raphael while Veldora's Unique Skill Investigator evolved into Ultimate Skill Faust - and thanks to these Skill evolutions the analysis time of the Infinity Prison got reduced from about 100 years to just 1 day. As a result, Rimuru obtained Unlimited Imprisonment himself, which was then integrated into Ultimate Skill Uriel.

Following the battle with Granbell Rosso and the rampaging Chronoa, Raphael combined it with Usurper and Absolute End to create the Ultimate Skill Yog-Sothoth.