Saisoku Shinka no Slime Musou ~Cheat Skill "Slime" ni Yori 100-baisoku de Level Up shite Sekai Saikyou ni~

Alcus, a member of the adventurer party "The Cruel Blade," is suddenly expelled by their leader, Dan, on the grounds that his skills are useless in combat. However, his skill <Slime>, which allows him to transform into a slime ("Mimicry") and create slime clones ("Splitting"), has a secret: the experience points gained are doubled for each clone created.