The Demon Lord - The Conjured Calamity is the first boss that is encountered in Dungeon Defenders: Awakened. He is fought after beating wave 5 of Campaign or Survival wave 25 in the Alchemical Laboratory.
Alternating between strong melee and lingering fire trails on the ground, fireballs while airborne, the Demon Lord is particularly dangerous to hero defenses. He (and other boss monsters) target(s) heroes before defenses, though the latter can be damaged indirectly.
The four pylons surrounding the Eternia Crystal can be 'destroyed' to paralyze the Demon Lord for a time, giving players a chance to freely attack him. The pylons must recharge afterwards before they can be reactivated.
When the Demon Lord is defeated on any difficulty, all players will receive a Sapphire Brooch and a hero specific weapon. At lower difficulties its just a better version of a common weapon. In Massacre, a special weapon from the boss is rewarded instead.