I find that with most bosses, if u are a ranger, u should first hit it with frost arrow then elven shot, then run around and shoot at it. keep running.
Great game, but it was a little too easy once you get the laser towers. Maybe you could make them a little more expensive? And I also experienced the glitch that made me stay on the far right of whatever floor I was on, unable to reach the elevators b/c I keep teleporting back to the far right if I got too close to the elevators. 4/5.
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