The Snappening

Build up
Nearly Headless Nick-core and Hagrid-core were tag team partners of Splash Mountain. When Nick accidentally killed Hagrid, he went to a dark place. When the Power of Halloween brought Hagrid back, he had a lust for revenge towards his former friend and tag team partner. The crowd turned on Nick and he lost his status as a crowd pleaser. It drove him mad. He began to search for power.

The Stones
The Stones were teased in fall of 2018. Nick learned of their unlimited power and sought only to control the Stones. He eventually got his hands on a few of them, and with their godlike powers began to feel more in control, but in reality grew more and more insane.

The Snap
During the last episode of 2018, Nick walked out into the ring with a golden wrestling glove on his hand. The glove contained the Stones. As he walked into the ring he snapped his fingers, causing a brilliant white light and silence. In real life, Nick showed up in a room filled with white light and smoke. Hagrid was standing at an archway, and asked if Nick did it. Nick said that he had. Hagrid asked what it cost. "Everything" Nick replied. The screen then was filled with images of wrestlers that had been "dusted". These include

AT-AT

JJJ

Obi-Wan-Kenobi

Spider-Man

Thrawn

All of Wolfgang

Dr. Strange

Grievo

The Mystery Men

Kylo Ren

Maul

Old Luke

Lego Mace Windu

Landon

Old Ben