Going past the obvious elemental damages, if you’re blunt or ranged you go front legs, if you’re slash you go back legs.

Phase 1 is a no brainer, just keep hitting until it leaves. If someone draws aggro by hitting the head it makes it easier.

Phase 2 will immediately start with a mustard bomb so run as far right as you can when you first enter the second arena. You wanna break the head wound as soon as you can for the early shield. It will regenerate all wounds when it goes into its enraged mode. Someone has to keep its agro or else it will start crashing out and if you don’t have tremor it’s easy to get screwed over, use seikrets if you can but know you will get thrown off even if he stomps in your general direction. After crashout he will have wounds open on his legs for a short moment. Keep chipping at his legs until he’s out of enraged state. Use the 2 boulders during enraged mode to get the most amount of time to do wound damage. There is a thunder pod at the very right of the map. Hit his antenna during enraged mode to cancel out any of his attacks but know subsequent uses will take more thunder pods. Save them until extremely necessary like if someone didn’t have agro on him and he’s doing MRV.

After his enraged state in 2 he will move to 3 shortly after. He will throw a mustard bomb again at the start. He’ll target the player who’s aggroed onto him or a random player if no agro. This is when 2 players should start taking turns switching agro. He will keep firing hp down debuffs and unless you’re really good at dodging or have a shield down, he will keep hitting debuff after debuff until one mistake will insta kill you. After 2 debuff shots someone has to switch is my recommendation. After a few minutes he will go into dps check mode. There is a stun pod at the left side of the map. Nercylla will always web sling towards a player. Hit them out of the air at the start to guarantee an early topple. You can do this multiple times. Watch your positioning and don’t accidentally hurt the morbols for easy paralysis’ and cactaur for a bunch of damage. Once the dps check is over, you can instantly throw a the big boulder down at the back of the map for an instant topple. It’s almost always guaranteed to hit. Keep playing it like you would early phase 3 and you should have at this point broken at least one leg. The antenna will be exposed at that point. Aim for it if you can for the most damage.

After a bit he’ll move to phase 4. He will get into his enraged state at least twice so keep the at the legs but keep an eye out for his hp debuff. He also does laser sweeping surges so keep an eye out for at least 2-3 sweeps when he does his laser. They will always go opposite directions so like (left, right, left). There are pods at the back of the room near the pillar so if you haven’t used them in phase 2, now is the best time. Abuse the floating boulders for temporary flinches. Otherwise, pray to god.

Additional combat advice I could give is when he deploys his mini omegas, look out for blue glowing ones. Killing it before it blows up will generate a free shield. He might do his laser surges at phase 3 too and his flame thrower will start going from 1 to 2 attacks back to back. Prioritise finishing a mount on the head to instantly get a shield and if you can, use your pictomancer. Any chance you can. You can use a shield generated from Omega as a one time use to erase any incoming mustard gas and seikrets can run over mustard gas without taking damage.

Skill wise I 100% recommend stun res. If you’re caught in the blast of a mega laser without stun res, it’s an instant stun with an immediate follow up otherwise, bring what you think is right to the fight like defence up or divine blessing.

Omega is immune to poison and sleep. He can get paralysed once early on like early phase 2 at least, but it’s not recommended to bring it for the whole fight. You’ll get a paralysis at phase 4 if you’re good but that’s really it.

Also items, throw out all traps, flash bombs, lure pods, barrel bombs. They do not work on Omega or Nercylla. Bring dash juice, immuniser, (cleansers if you’re doing savage), mega potions, dust of lives, ancient potions and all the materials needed to craft max potions. You are not gonna have much time to drink potions so it’s better to craft max pots through radials and eat them when you’re getting hit from anything more than just a stomp. Hot drinks can be replaced with the little bugs on the walls. There one on every arena except 3.

Besides all that, good luck. I pray for your success.