Slime Isekai's power system centers on Named Monsters and Skills. Every creature has innate skills. Unique Skills are rare and powerful. Ultimate Skills are the peak — only the strongest beings possess them.

Skill Tiers

TierDescriptionExample
Common SkillsBasic abilities most monsters haveResist Heat, Sharp Claws
Extra SkillsAdvanced abilities requiring specific conditionsWater Manipulation
Unique SkillsRare, powerful individual abilitiesRimuru's Predator
Ultimate SkillsThe peak of skill evolution — each represents a cosmic conceptRimuru's Gluttony King Beelzebuth

Predator / Gluttony King Beelzebuth

Rimuru's core ability — absorbs anything, copies its abilities and skills, can combine multiple absorbed abilities. Over time it evolves from Predator → Gluttony (Unique) → Beelzebuth (Ultimate). Each evolution multiplies its capability.