Get like 30 stone pillars, 20 ceilings, a net gun and a snow owl or something, with a lot of HP. Once you have found one, place the pillars in a square: four long and four wide. plus two up. but leave one side open! then you get the Managamr's aggro and slowly go to the trap with the owl. If he jumps away, watch him, he'll come back. As soon as he is in the trap, fly through the pillars with the owl, get off very quickly and shoot the mana with a net. Then you fill the gap and then place the roofs. have fun with your Managamr!