This is a page on the NPC Pythius The Rotten, if you meant the creature, see Pythius The Rotten (Creature).
Location
Beregar caves.
Notes
Pythius the rotten is an undead dragon living on Beregarcaves. He claims to have obtained his treasure from the civilization of Yalahar when they started their downfall. You may challenge him as a part of The Hidden City of Beregar Quest. You may access the teleport next to him leading to a dragon lord lair if you give him something for his treasure.