Residue Evil

Easy Solo Achievement for Level 70 Dragonflight & Beyond...

1) Mythic Difficulty.

2) Achievement can be tracked, and will turn from Red to White when satisfied.

3) Simple enough. Clear the trash in the entire circle.

4) Pull boss. Eventually Fleeting Manifestation spawns.

5) Bring a Fleeting Manifestation to one of the prison doors holding Forlorn Captives.

6) Manifestation eventually dies, but leaves behind a residue on the ground that seeps into the cell and eventually kills the Forlorn Captives.

7) Rinse & Repeat until you have 8 dead.

8) With the achievement satisfied, kill boss.

9) ?

10) Profit. Achievement Completed.

Even as a level 80, this hurts to do. If you're taking the full damage it does 1 million dmg on you (from the ground).

Best bet to do this is simply to put the ad close to the gates, where the prisoners are and just let them die by themselves, without standing in the goo.

When the ring is full of the goo, and there is no more places for you to stand, you know that you're about to finish the requirements for this achievement.

Residue Evil (2nd boss - Executor Tarvold)
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Video with short voice-over guide.

We opted to 2 heal the remaining achievements in this dungeon to make them a lot easier.
- Clear all the trash across the entire ring around the boss
- Look into each cell for Forlorn Captives, and place a raid marker on that cell to make it easy during the fight
- There are 2 groups of 2 on each side of the boss
- Pull the boss, he will spawn an add called Fleeting Manifestation - do not dps it
- Kite the add and boss next to the cell with Forlorn Captives, the add will explode once it has gained full energy which will kill the captives inside the cell with the pool of blood from [spell=323551]
- Repeat this for all 4 cells to kill the 8 captives, then kill the boss.

Link to the rest of the Glory of the Shadowlands Hero guide.