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Fairy. Because it’s a non-targeting spell.
New here? I'm Roha — want a quick tour?
What about the master gremlin? By the time the centaur gets close, the gremlin will have already managed to hit it with at least one direct arrow (if the centaurs go first). If the gremlins go first, then one direct arrow and at least one indirect arrow.
They are all great when you have a lot of them. When I play as Necromancers, I usually defeat everyone not so much with vampires or someone else, but with skeletons, because it's easy to gather a sufficient number of them.
I don't think this will affect the outcome of the battle in any way... What can you say when a centaur has 2.5 times more health? It's even funny to argue...