You only go up to the ship once. If you’re going twice you’re doing it wrong.
For those struggling think of the fight as having fail points instead of something you just kinda float around doing and hoping it dies, and use the wings as often as possible.
Start the fight at the ent, kill everything that spawns until first annihilator, after annihilator dies kill a few more adds spawns then get to the top most platform for the next annihilator.
Fail point 1) if you’re taking too long to get there and the annihilator is attacking Eonar, refine your route until you’re killing it as it spawns(USE THE SLIPSTREAMS/WINGS).
After the 2nd annihilator dies, drop straight down and kill any adds that came from the first spawn, and the other adds coming around from the other walkway, the portals spawn, but you don’t go to the ship until Eonar procs her giant AE that kills everything(This procs from killing adds) this is Fail Point 2, if you take too long to proc the AE you’re wasting ship time(Again, use the slipstreams/wings)
Fail point 3) soon as she does her giant AE use wings and go up to ship portal, kill add, use wings to get to the crystals, use em on CD to get to the Crystals asap, if you take too long, you die, pretty straight forward.
Fail point 4) get off ship after clicking all 4 crystals(Try to make the red crystal the last one you click), get to next annihilator, if you take too long it’ll nuke Eonar, you die.
After that you really don’t have a ton more fail points. The biggest part is not going back up to the ship, and more importantly the Legion summons flying units at one point, you want to stagger your add kills so that when Eonar uses her next big AE she hits those fliers, that should end the encounter before the next Final Countdown from the ship kills you. You don’t need to go back up to the ship. If you mess up the timing and the fliers aren’t hit by her AE, you can still win/adjust by focusing them down as they fly around the room, and also killing any remaining adds running around.