To gain an additional Fury, you need to deal 300 damage, which is 18.75 beasts/Furies or a little over 14 Megeras. Their initial growth is 5. To gain one Minotaur, you need 1200 damage (which is +3 Furies), almost 40 Minotaurs (:eek: !!!:eek: ). And their initial growth is 6. So, I think sacrificing Dark Elves isn't very profitable. But you can still get some benefit. Maybe 5 years after the start of the game.
We need to find something more profitable...
Added 8 minutes later
If you kill a Black Dragon, you won't get anything! It has 240 health...
:eek: :eek: :eek: :eek: :eek: