It's tricky to beat him and there are several ways to do the basic strategy. Here's what my clan does. 1. Take out 90% of the smaller foes, they won't respawn 2, take out glowing servator (only one person needs to do this - the others just shoot anyone left over) 3. Shoot skolas with heavy or snipers. Repeat until chains are broken. The trick here is that you have the poison that you have to pass around. There really isn't a trick to it, just watch the timer and stay in order. Step 1 kill the smaller foes again. Usually they don't respawn unless you do damage to skolas. Step 2. When they are gone use synth if you need. And then use everything you have on skolas (we found the Ghorn does it pretty quick if all three members have it maxed. Black hammer is good too) Fail to kill him the first try means dismantling mines with foes. Rinse and repeat. If you do manage to kill him the first time, you can dismantle mines easily, but you still have to do them. That's the best strategy I know. It helps also to have at least two titans or warlocks who can generate a crap ton of orbs (Titans are best because the bubble gives you cover from splash damage). Also I found the ledge to the right is best, skolas won't appear next to you.