You can resurrect level 5 units (except Black Dragons) with the healing ability of the demonologist. For every heal (one charge per stack of demonolists, so split or phantom) you need an enemy stack to leech the hp from, so plan accordingly.
You can also increase the number of level 5 units:
- sacrifice parts of one stack to increase another stack
- heal (spell) the first stack to max hp and resurrect 1 unit with the demonologists
- repeat step 2 until first stack is fully recovered and start with step 1.
Costs a lot of mana though..
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