Rimuru backs Clayman into a corner trying to get him to reveal who he's working for, but even on death's door, Clayman's lips are sealed. Left with no other choice, Rimuru finishes Clayman off. With Clayman dead and Carrion and Frey announcing that they're stepping down as Demon Lords, the total number of Demon Lords including Rimuru is reduced from ten to eight. Guy coerces Rimuru into coming up with a new name for their group, and Rimuru's solution is "Octagram," representing each of the Demon Lords as an eight-pointed star. Thus a slime became one of the eight Demon Lords, marking the start of a new age.
That kind of complacency 
is what leads to defeat!
!هذا النّوع من الرّضا عن النّفس هو ما يقود للهزيمة
Genau durch solche Unumsichtigkeit
verliert man am Ende!
Cuando bajas la guardia
acabas perdiendo.
Cuando bajas la guardia
acabas perdiendo.
Trop de confiance en soi
mène à la défaite.
È proprio quando sottovaluti il nemico
che sei già rovinato in partenza!
Esse tipo de falta de cuidado
é que leva à derrota!
Чрезмерная самоуверенность —
верный путь к поражению!