The Corruption

The Corruption was an extradimensional being that possessed the Summit Dragon Egg for a while, attempting to break free into the Overworld with the help of the Children of the Wither cult.

Forms

 * The Corruption's first form was threatening, but stale and unmoving. Daymaster noted it to be like a living being without the "living." A small clump of crying obsidian surrounding the Dragon Egg, Wither heads sprawled around the mass.
 * The Corruption's second form saw the first appearance of its "End Tendrils." These were long, spiraling appendages of Endstone and both variants of obsidian, often breaking into the summit floorboards and dark oak walls. The main mass also grew bigger.
 * Its third and last known form had The Corruption engulf the Dragon Egg. End Tendrils spread to the summit ceiling and nearby shopping district, even growing chorus stalks in darker, damper areas. A soul sand "T" sat atop the place where the Egg used to go. The Corruption retreated soon after this form's appearance.

Trivia

 * The Corruption was likely allied with the Wither, a being everyone in the Children of the Wither cult was enamored with as well. This would explain why the cult wanted to protect The Corruption so badly during its nesting period.
 * On April 2nd, 2021, Downfall brought an unidentified dragon egg to Frostonia, naming it "Bapy" and repeatedly exclaiming it was the shared pet of him and Daymaster. The egg is kept locked up by Day for unknown reason.
 * If The Corruption's transformation was completed, its final form would've likely been a somewhat buffed Wither.