Do mercenaries have reservation of mana for their auras like players do? (related to blood magic)

Question: Do mercenaries have reservation of mana for their auras like players do?
The reason I ask is because I want to put Malachai's Simula (has blood magic on it) on my mercenary with an aura (i.e. Envy). But if the merc has blood magic, does that mean they reserve half their life instead of mana? Worried because then it means if they reserve 50% life, they have 50% ehp. Thanks!

Ok, I got curious and tested this myself. TLDR: Mercs get benefit of 10% more life from blood magic but not the downside of having to use life to reserve auras. (I used negative regen kalandra jewelry and also chest that gives zealot's oath). With and without blood magic, they degen at exactly the same rate.