There are two methods to play a minion master, Ventari's Sacrifice (to kep them alive) or Death Nova (to make their death useful). Both can be very useful.
But a minion master is somewhat binary, either he is extremely useful, or he is very weak. Most of the time it is the later, but it is compensated for those times he is useful. The "onslaught" scenarious where youy have to protect a npc against waves of monsters are much easier with a minion master at your side.
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