Xy Never, Ever Marks the Spot.

Alright i did this boss with 2/3/6 small group to be manageable not chaotic anyway the way you get the artifact:

There is 3 platforms and the artifacts show up the order is random so you have to keep an eye on it however it will show up in the pull / 75% / 50% while the boss is immune

The first debuff : damaging debuff like 2K or 5K i don’t remember honestly but it scales with your group regardless

Second one : is movement speed reduction ( 30% ) this is where you have to note something for example disengage talent that removes your speed reduction matters because if you remove it you literally screwed the achievement shapeshifting matters so you need a warlock or venthyr to do it smoothly

third debuff : your health is reduced 25% which you can get one shot by anything so be careful

tips i can say you need for this boss get a warlock / priest + a venthyr player so he/she can go there click on the artifact
you dont need the entire group over there you just need 1 player go there click and go back

i will still write about any missing achievement that nobody did any guide on so yep you can add me in discord if you wish for explanation or showing you the pic's of the worm or halondrus fight or any ach regardless

With the hotfixes on June 6, it appears that abilities that remove slows will now no longer cause you to lose one of the debuffs and thus fail the achievement.
"Artificer Xy'mox: Fixed an issue where Crippling Ephemera could be removed prematurely, blocking achievement success."
I haven't tested this myself yet, so maybe someone can confirm it.

Xy'mox - Xy Never, Ever Marks the Spot.
- Collect 3 artifacts for 3 debuffs and then defeat Xy'mox with ALL players under the effects of ALL debuffs.
- Artifact Locations. Need movement ability to reach. Only a single player needs to interact with each artifact.
- Artifacts spawn one by one: On pull / 75% / 50%. Debuffs: [spell=367220], [spell=367275], [spell=367278]
- Assigning players to the artifacts is recommended. Demon hunters are great.
- Do not use any ability that remove slows. This will remove the slow debuff and fail the achievement.
- Death does not remove debuffs.