The Orc Lord

The Orc Lord 「オークロード, Ōku Rōdo」 is the tenth episode of the anime adaptation of That Time I Got Reincarnated as a Slime.

Synopsis
Rimuru's village enjoys their banquet while he, Rigurdo, Rigur, Gobuta and Kaijin hear about the Ogres' story from their young master, after which he suggests them becoming his subordinates to increase their overall fighting potential. After a night's thought, the young master agrees to it and Rimuru decides to name all of them causing their evolution. Meanwhile, an army of 200,000 Orcs make their way towards the Lizardmen's residence who attempt preparations for backup to fend them off, realizing the enemy leader might be the legendary fearsome monster, the Orc Lord.