Author: the name of the ultimate skill is fuck you and fuck power scaling
Author: the first power of the skill is to fuck power scaling so rimuru is fuck invincible that makes power scaling rimuru is fucking useless and the tier is upper 0 fuck you
Author:the second power of the skill is to fuck your opponents power for an example if touma kamijou from the certain magical index touma has power to destroy a weapon that can destroy infinite universes but rimuru can make it useless in a instances
Author:the third power is defensive the power to nullify concept to defend you it can even nullify the power to nullify concept to defend you for an example the power of yogiri takatou from Instant Death is to instant kill someone it have the power to nullify concept to kill someone but the skill can nullify the instant death of yogiri without problem
Author: the fourth power that can kill plot armor from a mc or even the whole multiverse