Ley
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Decided to share my opinion...
Wolves... berserkers... fairy... centaur... :)
Why a fairy...?
Because she's small and defenseless... but she has a trick: she doesn't take damage... and in general, fairies are the most evil creatures in mythology, despite their appearance :)
It sounds strange to ask this question. And in what sense "powerful" - if in terms of strength, then definitely not a fairy, in terms of usefulness - I think a fairy has helped many, - and she's also immune to retaliation and you can use the fact that she can fly ;), but in general, I prefer wolves and archers.
"Единственное, что можно сказать с уверенностью об удаче - она изменит..."