Rimuru was able to find the walls that separate Realities and the outer Void. Different realities, Universe and more. Anos: "Interesting, ahahaha i didn't expect someone matching me and another Demon king no less" Azusa: "(Gulp) i-i didn't mean to ki-kill your kin, I didn't even know slimes had egos before i met my daughter's" Shiro: "I see, so... Do you want meat?, we can be friends" Marika: "This is the captain Marika, may we know who you are? That ship is interesting" Kazuma: "Is that really a ship?!" Tanya: "Ridiculous, is this your schemes?! Being X"