Keep DPS-ing and Nobody Explodes

When you enter the dungeon, the HK-8 Aerial Oppression Unit will be hovering over one of the first three bosses. To activate Hard Mode, you must defeat each of the first three bosses while HK-8 Aerial Oppression Unit is patrolling above them — do not skip to a boss that HK-8 is not hovering over.

While fighting each of the first three bosses under HK-8, Walkie Shockie X1 robots will spawn, follow random players, and use Static Discharge — they are immune to damage but can be crowd controlled, and will self-destruct upon reaching full energy, so use crowd control to manage them while continuing to burn the boss.

After killing Tank Buster MK2, tag HK-8 Aerial Oppression Unit with a ranged attack, then run back toward Rustbolt (entering from the left to avoid the instance portal) and wait in the inn area near Niru Datagear until the Annihilation cast finishes — immediately after it completes, jump off the Rustbolt platform toward the boss to close the distance before it resets, then hack the Overcharge Station and defeat HK-8.

At the High Tinkertory, click the red button to confirm Hard Mode is active — if no red button appears, Hard Mode was not enabled and you must try again next weekly reset — then pull King Mechagon and defeat him through Phase 1 and Phase 2 to complete the achievement.