The Executioners are a group of humanoids loyal to Shao Kahn.
They appeared in Mortal Kombat (2011) in the background of stages such as Armory, Goro's Lair and Dead Pool.
They are seen on these maps torturing and metal-working, and in Jax's segment of the Mortal Kombat (2011) campaign, they are seen gambling with 8 sided dice while under the command of Sheeva. Executioners are seen wielding Cudgels during a cut-scene.
In Mortal Kombat 11, they didn't return in the background of Dead Pool.