Lord Hart

Lord Hart is completely flipping insane.

One of the three necromancer lords, the chaotic lord of Darkwood and the Shuffling Waste. He resides in a voodoo hut in Darkwood which teleports at random intervals.

He seems to be a spirit shaman. His dissociative personality disorder is probably a symptom of long-term over-exposure to these spirits. We don't have many details on these spirits, but they might be from different continents. They are definitely from different ages.

Necromancer War
Lord Charon and Harken wrote disdainfully of Hart. Harken named Hart as responsible for the titular cataclysm of Cataclysm. They seemed to break ties with him after that. Harken's General Lehm destroyed the outpost in northern Darkwood where the cursed girl's spirit

Personalities
Friendly healer who "helps souls pass on". Wielded very holy power which restored the party and healed the trees temporarily. Didn't know what "undead" are. (49)

Lady who lived near Seer. Had a sister in the Cataclysm capitol, Arcadia. Seemed to be lost. (64)

Silly guy who called Akur Spencer. Obsessed with Spencer's birthday. Called Buck and Grawlamin silly names like "Tiddledum and Timmy". Removed Akur's ability to sleep, which led to Akur going insane and essentially becoming Spencer.

Hart Personality
Briefly spoke to Akur in the voodoo hut, very angry.

Spoke to Buck and Grawlamin in the forest. Was very quiet, and sinister. Whispered about "them", and something that could be heard.... but Grawlamin and Buck couldn't hear it. Then proceeded to teleport them to High Crest.