I play games like this all the time but I'm really bad at them. A build that works for me on this game is 1 tanking warrior on the front line and a back line of 2 rangers 1 summoner. The rangers can cast Natures Balm to keep the tank alive early, and then after the summoner gets the Bloodsprite spell, and the rangers get Hail of Arrows you are well prepared for any problems.
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