Talisman of the Sphere

From Dungeon Master's Guide, page 207. Found on Magic Item Table I.

Description
''Wondrous item, legendary (requires attunement). 1 lbs.''

When you make an Intelligence (Arcana) check to control a Sphere of Annihilation while you are holding this talisman, you double your proficiency bonus on the check. In addition, when you start your turn with control over a Sphere of Annihilation, you can use an action to levitate it 10 feet plus a number of additional feet equal to 10 x your Intelligence modifier.