Highly Communicable

Clear all trash in De Other Side before attempting the achievement. Completing any other dungeon achievements first, then resetting to attempt this one alone, makes the run cleaner.

During the Hakkar fight, have two party members afflicted with Corrupted Blood and stack them together. If Hakkar gets stuck in an infinite Blood Barrage loop, auto-attack him down to around 70% health before he casts Blood Barrage or Blood Barrier to bypass the bug. If a Blood Barrier does appear, break it with auto-attacks without canceling the fight, and Hakkar will resume casting Corrupted Blood normally.

Corrupted Blood bounces to nearby players at the end of its duration, so keep the two afflicted players stacked closely together at all times. Avoid any separation on the Z-axis, as vertical distance will stop the debuff from spreading. The debuff can be swapped to different players throughout the run and does not need to stay on the same two people the entire time. Mounting and eating are both allowed while carrying the debuff.

After defeating Dealer Xy'exa, do not take the green portal or flight path, as the travel duration will remove the Corrupted Blood debuff. Instead, go to the right of the portal and walk up the ridge manually to reach the next area.

An alternative approach is to have two characters stay stationary near Mueh'zala and pass Corrupted Blood between themselves while a third character defeats the remaining bosses independently, since the achievement only requires at least one party member to be afflicted — not that the afflicted player be present in each boss room.