The first part of the Weekly Heroic/Nightfall strike on Venus in the Ishtar Sink in Destiny is reasonably straight forward. Don’t let any of the enemies get close to you since they will melee kill you in one hit.
Beating Sekrion, Nexus Mind in Level 28 Weekly Heroic/Nightfall Strike in Destiny
There is a rock just to the right of where you jump into the cave in which you fight Sekrion in the Weekly Heroic/Nightfall Strike on Venus in the Ishtar Sink in Destiny. At the top of that rock you can sit on a ledge which puts you just out of line of sight of Sekrion’s guns meaning he can’t hit you. Be aware of the adds that spawn in, the can still flank around and kill you from range. There is also a little cave to the left of the rock you can hide in if you get overwhelmed.
Sekrion, Nexus Mind, like most other enemies in the Weekly Heroic/Nightfall Strike, are weak to solar damage. The critical spot of Sekrion, Nexus Mind is the glowing front part of his head.