in a group the first part is simple if you have Harec and the person usin him knows what hes doin. From spawn immediately turn round (just like in the vid) you may see a tentacle, if its the destroy it, if not go to bridge. From hereHarec should stand behind the wall at the top of the stairs the rest either the stairs leading bk to spawn the lone pillar on the stairs leading to the area below and another behing the rectangular blocks on the bridge, once you in position all you gotta do is keep the enemy away from Harec while he teleports (RB) all around to various towers to destroy the tentacles. Of all the places tentacles will be i only know of 1 area that he cant get using this techique, its directly underneath the beholder slightly to the left (as you lookin at it from the bridge, its like the one shown in the vid but its positioned on directly below where the character was standing (in the vid) not opposite him. Unless you unlucky enough to get this 1, you can can get all the tentacles without ever leaving the bridge, as for destroying the behilder, hide behind the single rectangular object on the bridge wiat for it to come to you then rip into him, just hold fire when the light beams change color so you dont get fried. The second part Lycus can help a lot, dispatch some of the trash and Lycus can approach shield up (RB) close to him (not too close because his AoE) and draw fire, Kuzzman b aggroed to Lycus leaving him vulnerable to quite a few headshots from you team, wen his shield turns red, retreat recharge then start again. Harecs can snipe even wen he flies upto the towers a lets loose an AoE or to electrocute shea, make full use of it. Lycus shield comes in handy during this phase, use it to keep him occupied while your team mates get the levers to prevent sheas demise.