Please refer to https://www.wowhead.com/guides/lihuvim-principal-architect-encounter-journal-boss-abilities-raid-loot for full information.

Brief Description:

Two alternating phases.  A boss phase, and an adds phase.  On the adds phase in Normal there are three adds, Three normal adds called Acquisition, Guardian and Degeneration.

• Acquisition increases your damage taken and does massive knockback.

• Guardian spawns a floating orb that does damage periodically.

• Degeneration spawns lots of little adds.

There is an additional add on heroic that creates a shield for the other adds.

• Some players will get a yellow arrow and yellow circle, and the debuff Deconstruction Energy.  Cover stars with the circle to get rid of them.

• Boss does a knockback - don't get knocked into stars.

• Watch out for boss frontal cone.

• Tanks - one tank takes every cast of Resonance, other takes Sundering Resonance.  Both do damage to anyone within 12 yds, with increased damage to one who has the other debuff.

• Add phase starts when boss gets to 100 energy.

Adds Phase:

• Adds will start activating on the circles around the room and boss will pulse stacking debuff.

• Wait until the boss is around 80 energy then check which adds a spawning.

• You can either split raid into two and try and kill two before they activate, or everyone go to one to definitely down it.

• Everyone stand in a golden circle around an add to clear the debuff.

• If an add activates before you kill it, it will activate at 100% health.

• Add kill order: Acquisition > Defence Matrix (Heroic only) > Degeneration > Guardian.

• Once boss phase starts again, finish off adds asap.