Build Description
hint 1 aura stack, 6du buff beam, 3 du reflect in front and 1 du reflect behind the minions,
hint 2: build 4 du buff beam with 4 reflects boxing the dst's and the 2 lightnings in them, then put 3 more going parallel to the longer reflects, thus making it so the boss won't be able to shoot your lt's and dst's. Making the boss wave last as long as you need to kill the boss.