5e SRD:Talisman of the Sphere
From D&D Wiki
|This material is published under the OGL 1.0a.|
Wondrous item, legendary (requires attunement)
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 × your Intelligence modifier.