Enderman

He put a block for you to sit and rest.

You are a monster that dwells in hell. You are a ghast, a monster with closed eyes and mouth, but upon seeing a player, you start shooting fireballs at them. You can fly, which is a plus for you. You have a friend, an Enderman. He can pick up blocks, place them in another location, and teleport.

Once again, a player entered your hell. You were flying over the lava and spotted the player. You opened your eyes and started shooting fireballs at them.

After killing him, you grew tired and landed on the surface. An Enderman teleported to you with a block in his hands and placed it next to you, saying, "Sit down and rest."

You sat down and closed your eyes, resting. The Enderman looked at you and smiled, teleporting somewhere. After that, you began flying over hell again, checking for any players.