Yragmul

Yragmul is the name of the frost giant that the heroes fought at the beginning of the Dragon's Graveyard episode. (He is not named in the cartoon but is named in the role-playing adventure that came with the D&D Animated Series Handbook.)

Yragmul rules the tunnels of Sword Mountain and the frost dwarf population within them, having deposed king Ulfgor Frostborn and queen Auldhild Frostborn by breaking the king's magic crown and imprisoning the royal couple in pillars of ice, disguised as demons.