Necromancer

The Apprentice Necromancer / Necromancer / Necromancer Lord is an Unholy Boss that appears in the Ruins.

Ancestor's Memoirs: The Necromancer
"Mastery over life and death was chief among my early pursuits. I began in humility, but my ambition was limitless. Who could have divined the prophetic import of something as unremarkable as a twitch in the leg of a dead rat. I entertained a delegation of experts from overseas, eager to plumb the depths of their knowledge and share with them certain techniques and alchemical processes I had to found to yield wondrous and terrifying results. Having learned all I could from my visiting guests, I murdered them as they slept. I brought my colleagues back with much of their intellect intact - a remarkable triumph for even the most experienced necromancer. Freed from the trappings of their humanity, they plied their terrible trade anew: the dead reviving the dead, on and on, down the years. Forever."

Histroy
The Ancestor invited several scholars to study with him, only to murder them in their sleep. To show off his newfound powers, he had them brought back through necromancy. The Necromancer now lurks within the ruins, using his magic to bring the corpses buried deep beneath the ground to life as his servants.

Behaviour
The Necromancer starts in rank 1. Each time he uses an attack he creates a Skeleton in rank 1, steadily pushing himself back until he is in rank 4. His attack does not have to hit a hero in order to trigger this ability - therefore the only way to stop him summoning a minion in a turn is either to stun him, or for there to be 3 of them existing already.

Unlike most unholy creatures, the Necromancer has low resistance to Bleed.

Abilities
* Summon Sekeletons ability has following chances of summoning and will occur regardless of the abilities land or not:

Strategy
The most recommended way to deal with this boss is by having a character take care of the Bone Militia that are spawned, while stacking bleeds and focusing the other characters on the Necromancer. As long as you don't let him move out of your hit range, the battle should have no other issue than stress, as his attacks aren't particularly devastating.