Agaric - A mold-like aberration that fuses itself to corpses and splits to spread its influence. (Patreon)

An agaric is a strange type of fungi from the dark in between the stars. They are known as world killers due to their ability to split near infinity allowing them to easily take over empires or even whole planets so long as they have enough time to split, no two agaric look alike despite literally being created via splitting from each other. Some may have humanoid legs dangling below a fat fungal body. While another may have small, humanoid baby-like arms. Fully-developed agaric might look just like a human–all except for the single, never blinking-eyeball in place of its head, of course.

They fuse with creatures to better infiltrate humanoid society. They are quite slow on land preferring to swim where they move much faster. Due to strange magic, they gathered from a long-extinct creature their gaze and slow creatures down to the point of being nearly useless in combat. This along with their strange abilities allows them to overtake all life as they pursue what they call "The Last Game".

What little is known about the Last Game is that it requires the agaric to pretend to be a creature it has fused to and live out its life while attempting to make them a "hero". But due to their twisted thoughts of what a hero is an agaric will simply make the creature act as a horrible warlord that kills all who oppose them and use the gold they gather to give the weak a fighting chance against them.

When these events do occur they are called sleepless murders, walkers, and nomadic slayers.