I parse these between 37000-39800 HP. They do not summon; they do not randomly see invis. They will SOW and buff mobs within their range, making them a priority target if you are a kiter. They also are quick to debuff, be prepared to go without OoC regen often or annul the debuffs the hard way.
'Debuff' in this case means malo. I try to remember to leave a top spell slot empty for the purpose of having the malo land there, and me subsquently dispelling it. I hate these guys. They also dispell, and on occasion I have had them dispell the malo they just cast.