I did this one for the first time last night. First off, always hold out for the spellbinding golem to start. Invis your and move behind spellbinding. Have one char step out to the middle area and click the item to start the event. Clicking does not drop invis. You'll see an emote from the active golem. If it's not spellbinding, zone out and drop task. When you get spellbinding, his aoe will drop your invis and he will agro. Pull him back to the group and tank him in the corner.
When he dies, immediately pause macro and invis up. There is a short pause before the next golem activates as well as the adds popping. Once the task has updated, run to the door and zone out. You can rebuff outside and wait for cooldowns to refresh. If anyone died inside, you can send a rezzer inside with invis to drag and rez. Use the pillars behind the golems to block LOS. Don't forget to have a campfire outside the instance. Pet classes use this time to resummon and buff pets, they will be banished after each golem dies along with mercs (maybe?) and any adds left up from a previous golem.
When you're ready for the next golem, zone back in with invis and move to the active golem. Skip clearing the adds, they will despawn when you kill golem #2. Hex golem and lifebane golem have emotes to follow. Pay careful attention when doing hex golem that the char running away from the group does not Los agro the adds that we skipped.
After each dies, zone out so you can med and buff. The event never resets so you have 6 hours to kill 4 golems. When all 4 are dead, you have 5 adds to clear. The are mezzable and can be split with clam/paci if you observe Los. The last thing to do is click the siphon and loot the chest. You may be able to skip the last set of adds if you click the siphon while invis and out of Los, I didn't try.
Unfun fact: the event can bug. On a previous attempt, I wiped on golem #3 at 0% hp but he died to dots while I was in corpse hovering mode. The script did not update with kill credit. It stayed at "kill golems 2/4" even though only 1 golem remained. I was able to kill golem #4, click my siphon and loot the chest, get a Conquest achievo but no mission complete credit towards Hero achievo. I avoided a lockout timer, but it was already 2AM so I wasn't able to take advantage of that part.
