Talisman of the Sphere

Talisman of the Sphere is a magic item (wondrous item) of legendary rarity.

When you hold this talisman while making an Intelligence (Arcana) check to control a __sphere of annihilation_ add your proficiency bonus twice. If you are in control of a _sphere of annihilation_ at the start of your turn, you can use an action to move the sphere 10 feet plus a number of additional feet equal to 10 × your Intelligence modifier.