That Time I Got Reincarnated as a Slime episode 4

It aired on Tuesday, 23 October 2018.

In the Kingdom of the Dwarves

Rimuru and his companions visit the Dwarven Kingdom, the Armed Nation of Dwargon, in search of some artisans to help the Goblins learn to supply their own food, shelter, and clothing. However, a skirmish just outside the city gate lands Rimuru and Gobta in a prison cell. Then there's a report of an Armorsaurus in the nearby mines!