Luthas is the banana plantation owner on Karamja who plays a small role in the Pirate's Treasure quest. He can be found in his living quarters next to the plantation.
Luthas will pay 30 coins to players that fill a crate with 10 bananas. The trip back to Port Sarim costs 30 coins, so if a player is out of money they can fill up a crate. During the Pirate's Treasure quest, players must put a bottle of Karamjan rum in the banana crate to be shipped over to mainland. Luthas carries a monkey on his back all the time.
Luthas is the solution to the medium anagram clue: HALT US.