Four Ring Circus

You can solo this by bursting the boss in the ~12 seconds before the first ring comes out while holding the orb

On the way to Dausegne there are 4 large adds on the platforms off to the side. Didn't catch their names but they're on the platforms in this screenshot. We killed the last one on the left before boss room, but we assume killing any of them will drop the Afterlife Core. Once you have it one person can click to pick it up, and will be slowed while holding it. You get an extra action button that will allow you to throw it to a location on the ground, and if another person is there they will catch it. We did not test to see what happens if no one catches it.

We also assumed give the name of the achievement that you're intended to throw the Core to another player on the other side of the boss' Disintegration Halos and not let the Core touch those. However with the Core, though slowed, you can continue casting all your normal abilities. We found it easiest to give the Core to a mage and have them blink over every Halo. We're not sure if the Halo actually does break the core, but if it does you can wipe to reset and the Afterlife Core will respawn in it's original location when the boss respawns.

Contact me if you need help with the achievement, always happy to help guide people!
Btag: FrostyShot#1667
Discord: Yarini#9999

We have tried killing Colossal Realmcrafters on the right side and none dropped the orb, seems the only one capable of dropping it is the one add at left far side platform