Amulet of Edea

The amulet has a pedant that's in the shape of Toril. It contains the trapped elemental earth guardian Edea inside. To talk to the Elemental guardian within the locket requires attunement

Once attuned, and the wearer accepts to be the Champion of Earth, you gain the following benefits:

You're able to become a Sorceror, Warlock, or Paladin at next your level up. If there is a stat requirement not met, the locket will grant the minimum i.e. Str 13 for Paladin. You gain the benefits of Nondetection, as per the spell, but continuous. You also gain the ability to cast Plane Shift from the Material Plane to the Plane of Earth or from the Earth Plane to the Material Plane once per long rest. Finally, you learn and are able to speak Terran

If you attune to the necklace while on the Plane of Earth you gain the following extra benefits:

You gain the ability of being able to Burrow as per normal movement.You also gain resistance to Acid damage as well as +1 to your AC if you're wearing light or no armor

Notes: Bonus: Armor Class, Language: Terran, Resistance: Acid, Set: Innate Speed (Burrowing), Set: Strength Score