Tensei shitara Slime Datta Ken - episode 13 - 24 Dec, 2018

Rimuru's group come across Gabiru's sister, who informs them of Gabiru's coup d'etat and asks them to rescue the chieftain and save the lizardmen. Meanwhile, Gabiru and his troop find themselves cornered after the orcs eat one of the soldiers and gains their powers. As Treyni discovers Gelmud and Laplace and forces them to leave the forest, Gabiru struggles against the Orc General but is rescued by the arrival of Rimuru's group. The gang defeat the general and most of the orc army while Souei rescues the chieftain, after which Rimuru goes to confront Geld the Orc Lord. (Source: Wikipedia)