[quote who="[AC]DalzK" reply="1" id="2126381"]Maybe its because the enemy that you killed has different amount of HP each time? For example you kill a Rook who has 5k hp, you will get 1k hp back, but when you kill a Regulus who has 1.8k hp, you will get like only 360hp [/quote]
Maybe. It's hard to gauge this without replays, but I've several times killed a demigod who shouldn't be high-HP (say, Queen of Thorns) while I was near death, and suddenly had a full health bar. That would correspond to something like 15,000 HP! I may have my numbers wrong, though; I'll try to pay more attention next time I play Oak.