This 2-foot-diameter black sphere is a hole in the multiverse, hovering in space and stabilized by a magical field surrounding it.
The sphere obliterates all matter it passes through and all matter that passes through it. Artifacts are the exception. Unless an artifact is susceptible to damage from a sphere of annihilation, it passes through the sphere unscathed. Anything else that touches the sphere but isn't wholly engulfed and obliterated by it takes 4d10 force damage.
The sphere is stationary until someone controls it. If you are within 60 feet of an uncontrolled sphere, you can use an action to make a DC 25 Intelligence (Arcana) check. On a success, the sphere levitates in one direction of your choice, up to a number of feet equal to 5 × your Intelligence modifier (minimum 5 feet). On a failure, the sphere moves 10 feet toward you. A creature whose space the sphere enters must succeed on a DC 13 Dexterity saving throw or be touched by it, taking 4d10 force damage.
If you attempt to control a sphere that is under another creature's control, you make an Intelligence (Arcana) check contested by the other creature's Intelligence (Arcana) check. The winner of the contest gains control of the sphere and can levitate it as normal.
If the sphere comes into contact with a planar portal, such as that created by the gate spell, or an extradimensional space, such as that within a portable hole, the GM determines randomly what happens, using the following table.
d100 | Result |
---|---|
01-50 | The sphere is destroyed. |
51-85 | The sphere moves through the portal or into the extradimensional space. |
86-00 | A spatial rift sends each creature and object within 180 feet of the sphere, including the sphere, to a random plane of existence. |
Notes: Damage: Force, Damage, Control, Combat
Honestly interesting thought because it's not the sphere itself that's magic, but a magical field allowing it to exist. I'd think it would either disappear for a moment or be destroyed. Or if you wanted to choose violence? It makes a horrid fissure in space that slowly grows until the antimagic field spell ends.
I've made another version of it with growing capabilities and detailed rulings in regards to its usage and instability with a STR Save DC for sucking creatures to it while keeping the DEX Save when creatures come to its area as I found it to be quite weak when put in perspective to its lore and other legendary items. It's not busted as in previous editions, but it can certainly become if it grows enough. If you're interested, there you go =) https://www.dndbeyond.com/magic-items/9150979-sphere-of-annihilation
The wording of that talisman’s description makes me believe that it is intended to only have to make the control check once, unless someone else attempts to seize control from you, and it follows u around similar an Ioun Stone while not in combat. In combat it becomes “a summon” that requires ur action to move.
The wording in the description for the Talisman of the Sphere leads me to believe it’s a single check unless you’re forced to contest someone else’s attempt to seize control from you. https://www.dndbeyond.com/magic-items/4779-talisman-of-the-sphere