Talisman of the Sphere
Wondrous Item,
Legendary
(requires attunement; cost 85000 gp)
Crafting Components
Platinum infused with the essence of the Astral Sea
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.
Source