Shimmering Secrets

To get the achievement, you need to have six people each pick up one of the strange artifacts around the boss encounter, and then kill the adds that spawn in the last room.

Every person who grabs an artifact must make it to the final room alive or the adds will not spawn.

Six artifact locations:
1. On the path from the first room to the second room, on the right side. It's in-between two of the hexagonal pillars near the ledge.
2. Inside the second room, behind a statue on the northwest side of the room.
3. On the path from the second room to the third room, on the left side of the bridge. This one is closer to the door and is below the ledge.
4. On the path from the second room to the third room, on the right side in the corner after the bridge.
5. On the path from the second room to the third room, after the corner on the left side. This one is below the ledge and can be hard to see.
6. On the path from the second room to the third room, after the corner on the right side. It's right behind the little alcove in the map.

After getting all six artifacts and making it to the last room, six adds will spawn once the door closes. They all chain cast a spell that does damage and heals the boss. Use lust/hero here to try and burn them down quickly. Then kill the boss as normal.

Just to be clear, you can't solo it at the present moment.
This is because you can't pick more than one artifact per toon.
Maybe it will change in later xpacs.

alright this is one of the hardest achievement so far in the raid

so basically there are 6 artifacts around the entire fight i got all of their locations there will be one when the boss moves to the second room and when you reach there, you will find a hidden on in the back of the room and the last 4 when you are walking to the last room

you need the 6 players to gather up next to the pillar? idk what i want to call the glowing thing there and be close to it or anyone of them i didn't try the others but you will spawn 6 adds you have to kill them ASAP and use BL here because these adds heal the boss so much to the point if you are slow you might see something like, you reached the last room with 30%? you might see the boss 45%-60% so you need to be fast here