Aether-Weaver

Ecology
The Aether-Weaver is a heavily mutated aberration that has adapted to the shifting gravity of the Dead-Zone. While it resembles a Beholder, it has lost its traditional eye rays, instead developing a massive central eye that can manipulate the gravitational fields of its environment. It "floats" by constantly negating its own weight.
Combat Mechanics
The Weaver can reverse gravity in a specific 30-foot radius, hurl floating boulders telekinetically as a bonus action, and create "Gravity-Wells" that restrain and crush enemies (dealing 4d10 bludgeoning damage). It is immune to the prone condition and can use a legendary action to "Shift Gravity," moving any creature in the room up to 20 feet in a direction of its choice.
Loot
The "Weaver's Central Eye" is a powerful gravity-focus that can be crafted into a Gravity Stone or used as a component for a Reverse Gravity spell scroll.