I’ve not seen any info on this new event yet, so I thought I’d post some screenshots
A global message appears in chat:
The dark creature turns out to be on the Golem Island in Deep Artery Valley. He’s a level 250 Uncle Pumpkinhead with a huge health bar:
After he is killed, a tomb stone appears:
Running through it gives a present, like at the Desert Rider during the birthday event. I got a Metamorphogenetic Sleeve - Black. The Hollow Reaper himself drops the Reaper’s Robes/Legwear/Cloak.
I’ve had people tell me the respawn timer is 9-10 hours, but I’ve not been able to confirm this myself yet