In order to find this special creature you must first wake it by using the Dragon Head in its room, after having talked to the Crowned Tree.
Damage Taken From Elements
If fights in close combat using both Ice and Fire attacks. It uses the Ice Crystal Bomb almost every turn, which added to the melee damage means almost 1000 hit every turn, regardless of positioning. A thawing dragon lord will retreat at 150 (0.6%, deep red) health.
Stay diagonal to it as it because its strongest attack is the Fire Wave that deals massive damage.