Sphere of Annihilation

A Sphere of Annihilation is a legendary sphere that disintegrates almost all it comes in contact with and can be controlled.

Description
Sphere of Annihilation is a two-foot-diameter, black sphere of "void-like nothingness", hovering in space and stabilized by a magical field surrounding it. The sphere makes humming, vibrational noise.

Properties
Sphere of Annihilation the properties described in the "Dungeon Master's Guide 5e", page 201, unless otherwise noted. The sphere disintegrates all matter it passes through, leaving behind form roughly the shape of its sphere, and obliterates all matter that passes through it. Artifacts are the exception. Unless an artifact is susceptible to damage from a Sphere of Annihilation, it passes through the sphere unscathed. Anything else that touches the sphere but isn't wholly engulfed and obliterated by it takes 4d10 force damage.

The sphere is stationary until someone controls it. If a creature is within 60 feet of an uncontrolled sphere, they can use an Action to make a DC 25 Intelligence (Arcana) check. On a success, the sphere levitates in one direction of their choice, up to a number of feet equal to 5 x t their Itelligence modifier (minimum 5 feet) and it takes physical energy to do so. On a failure, the sphere moves 10 feet toward them. A creature whose space the sphere enters must succeed on a DC 16 Dexterity saving throw or be touched by it, taking 4d10 force damage.

If a creature attempts to control a sphere that is under another creature's control, they make an Intelligence (Arcana) check contested by the other creature's Intelligence (Arcana) check. The winner of the contest gains control of the sphere and can levitate it as normal.

Campaign 1: Vox Machina
The Remnants of Thar Amphala came into possession of a Sphere of Annihilation, and when the city of Thar Ampala was teleported on the shoulders of an earth titan, a group of Remnants used it as an excavation tool, digging their way down the body of the titan to exlpore the Crypts of Thomara that lie below.

When the group of Remnants were ambushed by Vox Machina, their leader and one of the chosen Remnants of Vecna, Viskorad, asked Odell to bring the sphere in the fight. After Odell's death, the sphere became vacant for Scanlan Shorthalt to take control over it. Vox Machina disposed of the Remnant's bodies, throwing them into the sphere, and Scanlan let it levitate along with the group on their jorney to Thar Amphala. Closer to the surface, Vox Machina noticed more Remnants. Scanaln disgused himself as Viskorad, convinced some of the Remnants and a rot behemoth to descend down and explore the crypts and recover an "ancient, dwarven artifact that bends reality". He also let Vislal, a member of the descending group, to take control of the sphere before they went down.

After a part of the Remnants climb down the stairs, Vox Machina assassinated the rest of them that stayed and Keyleth blocked the stairway with a Wall of Stone. Hearing the commotion above, the descending group of the Remnants turned back and dug through the stone wall using the sphere.

Trivia
Matt used the Sphere of Annihilation mini in to represent a Spiritual Weapon in a shape of a bullseye cast by Fresh Cut Grass.