Weight: 1 lb.
Estimated Value (Sane Cost Guide): 20,000 gp
DMG Value: 50,001+ gp
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.
Source: DMG p207