Writhing shared some tips for this encounter.
Talents - Backdraft / Reverse Entropy / Mortal Coil / Fire and Brimestone / Demon Skin / Grimoire of Supremacy / Wreak Havoc
Pet - Doomguard
Legendaries - None mandatory.
The boss' casted spell will simply one shot you. This cast should be interrupted by your Doomguard silence. If this is not up, use either Mortal Coil, or a well timed Fear to stop the cast. You should Havoc the wyrm boss, but it is not necessary.
The boss must continue to be interrupted during this phase. Use Fire and Brimstone (or Havoc) to destroy the eggs and totems which the boss spawns around him. Standing under the patches will cause the wyrm boss to lose his 9 stacks of reduced damage throughout the fight.
Once the actual boss dies, the wyrm will enrage, but you should be perfectly fine with Demon Skin. Save any remaining defensive or offensive skills if you find yourself having difficulties here, this fight has no important burst windows, and is a continuous repeat of P1 and P2.
Pandragon shared some tips for this encounter.
I was using Prydaz as a legendary really helped. Also used Bracers.
You can see the talent setup here. 897 ilvl.
Armory: At the time of posting this i have Prydaz and Draught equipped, since my other legendary is KBW. I did not use Draughts effect.
His felburst can get to a point where it will cast before Spearhand comes off cd. Torrent(if BE) or Stun him. I usually used Paralyze. When he summons the totem, a green circle appears on the ground. FSK hits it for half health, if you have Arcangolem Digit, it will kill the totem. Try to save clones for the worms, helps tremendously when downing them. Also, do not use Chi Wave for damage. Hold it for when you need healing. Be sparing with your heals against Tugar.
One of the biggest tips for Tugar: MAx camera distance, and stand so your camera is facing as much of the platform as possible, to see the totem being summoned.
Once Tugar is dead, the worm is a pain in the butt. His sonic scream casts more than your heals. Save them for after the scream. You can stun/paralyze the screams. Touch of Karma will full you if a scream hits it. So you can have one scream hit, then TOK the next one. Effuse helps in this phase, I was casting it a lot, as well as using Transcendence heal. Tugar took 12 attempts before I got him down. Got the worm down in that last one as well..
Beast Mastery Hunter
eschatological shared some tips for this encounter.
Legendaries: Roots of Shaladrassil, Mantle of Command
Talents: WotC, DF, Posthaste, Bestial Fury, Binding Shot, AMoC, KC
Played pretty sloppy, but got it within 10 pulls.
Don't know how I would have done it without the passive healing from legendary legs (not my normal setup, they've been rotting in my bank). Probably would have gone wyvern sting to interrupt the sonic scream from the worm (immune to interrupt, but susceptible to CC).
General strategy: Alternate Counter Shot and Freezing Trap to interrupt Fel Burst. One fel burst comes right after the earthquake/egg spawns, so I sometimes delay switching to adds to get the Fel Burst. Especially if I have to use Freezing Trap, as it has a travel time. This is why I also stand close to him, even when the pet has aggro.
The worm has 9 stacks of 10% armor reduction. I run a lot during the burrow phase to try and kite him thru the sand pits, which take off a stack. As you can see, by the time the main boss dies, his stacks are gone.
Only macro I used was for targeting the fel surge totems, as below:
/target Fel Surge Totem
/cast Cobra Shot