The Ancient Dragon is the third and final boss of the base campaign.
It has two primary attack patterns.
It begins by circling The Summit, and eventually stopping in front of 1 of 4 large ballistas to strafe and fire homing fireballs at both players and physical defenses (Apprentice and Squire towers).
The second pattern begins once he is knocked out of the sky. He will reappear at one of the three balconies on the map and remain there until a percentage of his HP is taken. At this point he will shoot a wide spray of flames in front of him, doing high damage to all players and any defenses in range.
Upon losing enough health, the Dragon will return to its first attack pattern.