Party: 1 TB monk, 2 summoners with monk/huntress pets (1 at hint 4), 1 summoner with EV/huntress pets
At hint 1, note that sludge launcher has a low profile, so it needs to sit on the ledge, I have all the squire build on the NE corner as well. Buff beam runs from post to post (or to the ground nearby, just be sure it buffs everything. I layed out the pictures here in the order I place them for LOS sake. The DST is almost straight North, you want the left side to just barely cover the crystal, but you don't want it picking up targets on the far West (the mortar covers them well enough).