Please refer to https://www.wowhead.com/guides/halondrus-the-reclaimer-encounter-journal-boss-abilities-raid-loot for full information.

Brief Tactics:

• White orbs should be intercepted at range before getting to the boss.

• Boss gains a shield at 100% energy, which has to be dps'd down.

• The shield causes raidwide damage and sucks players and orbs towards it.

• Tanks are targeted with Lightshatter Beam.  Causes damage and debuff.  Raiders avoid.  Tanks taunt swap after each beam.

• Giant yellow circles target raiders.  Spread out, then move after missile hits, to find a safe spot.

• Raiders will get a dispellable debuff that does ramping damage and a ramping slow.  Dispel (on heroic, dispel in path of white orb).

• at 80% and 50% health boss will move to new location, doing raid wide damage.  Follow.  Healers be aware of incoming damage.

• Whilst moving to a new location, raiders will need to run ahead to break golden orbs, otherwise they may end up knocked back and locked out of the next location.

• Use Bloodlust in third room.  Soft enrage as damage ramps up and orbs speed up.