Wondrous Item, very rare (requires attunement)
While wearing this amulet, you can take a Magic action to name a location that you are familiar with on another plane of existence. Then make a DC 15 Intelligence (Arcana) check. On a successful check, you cast Plane Shift. On a failed check, you and each creature and object within 15 feet of you travel to a random destination determined by rolling 1d100 and consulting the following table.
1d100 | Destination |
---|---|
01–60 | Random location on the plane you named |
61–70 | Random location on an Inner Plane determined by rolling 1d6: on a 1, the Plane of Air; on a 2, the Plane of Earth; on a 3, the Plane of Fire; on a 4, the Plane of Water; on a 5, the Feywild; on a 6, the Shadowfell |
71–80 | Random location on an Outer Plane determined by rolling 1d8: on a 1, Arborea; on a 2, Arcadia; on a 3, the Beastlands; on a 4, Bytopia; on a 5, Elysium; on a 6, Mechanus; on a 7, Mount Celestia; on an 8, Ysgard |
81–90 | Random location on an Outer Plane determined by rolling 1d8: on a 1, the Abyss; on a 2, Acheron; on a 3, Carceri; on a 4, Gehenna; on a 5, Hades; on a 6, Limbo; on a 7, the Nine Hells; on an 8, Pandemonium |
91–00 | Random location on the Astral Plane |
Some of the tooltips are broken on this. If I had to guess (in order), they're the Beastlands, Abyss, and Nine Hells.
Your guesses are correct based on the item entry in the DMG.
Every time you fail your Arcana check when using this amulet, you have a 1/80 chance of being sent to Carceri, the plane that is very notoriously difficult to leave.