Wax On, Wax Off

Easy Solo for Level 120 Battle for Azeroth, Shadowlands 60 and Beyond...

1. Normal Difficulty.

2. Pull Twilight Soul to the boss area before beginning fight, you'll find that add when you first enter the room of trash, it's to the left.

3. Begin fight, and reduce boss health to 20%. Be careful not to accidentally kill the Twilight Soul with your attacks.

4. Twilight Soul will turn blue.

5. Kill the Twilight Soul.

6. Kill boss.

7. ?

8. Profit. Achievement Completed.

On your way to the Sisters room you'll enter a large room full of trash and to the left you will find an isolated add called [npc=121498], which you will have to pick up and interrupt throughout the fight.

Bring the boss down to 20% health and the [npc=121498] will change its color to blue. Now you can kill the add, then kill the boss and you'll get the achievement.

The Twilight Soul respawns after a few minutes if killed.