The King of the Snakes was the leader of the snakes in the desert of Serenia. He was somehow trapped by a rock. The Wanderer helped him out by removing the rock from his tail, and in gratitude the king repaid the wanderer by giving him the magical phrase, Hiss.
Behind the scenes[]
The rock on the snakes' tail is one of two rocks that can be picked up in the desert. All other rocks in the desert have scorpions behind them.