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It's better not to think about summoning at all, but to summon mantises instead.
In my opinion, it's better to cast Dragon's Might on the strongest creatures... or, if you have a good number of them, use it on griffins – they'll deal serious damage to everyone.
"Никто не уходит из героев вечно", - убедился на личном опыте, гоняю в сингле до сих пор :D