Amulet of the Material Plane

The amulet is made of gold and has a heart-shaped centerpiece with decorations resembling the earth. The chain the wearer wears is also made of gold.

The amulet represents the heart and mind of humanity (which comes from the material plane) that has allowed it to preserve through many trials and tribulations. It will be friendly and supportive to humans that wear it but sarcastic to nonhumans that wear it. The amulet can only telepathically communicate to its current wearer. The benefits of the amulet (besides the Ability Score Increase) only extend to its current wearer 

Dormant State

Ability Score Increase: When dawning the amulet for the first time, the wearer must choose one ability score to automatically increase to 20. Creatures can’t benefit from this ability score increase more than once.

Identification: The amulet will inform the wearer if and where they are on the material plane. If the wearer is not on the material plane, the amulet only knows that fact and not what plane or where within that plane they are.

Regeneration: The wielder gains 1d6 hit points at the beginning of each turn

Spellcasting: The amulet has 9 charges which can be used to cast any fire, water, air, or earth-based spells that are 3rd level or lower-- the spell cannot deal psychic damage 

Awakened State: When the Amulet reaches an Awakened State it gains the following properties

• If you fail an ability or skill check, you may add 2d4 to the roll. You may do this a number of times equal to your proficiency bonus +1 per day. 
  
• The wielder has advantage on ability checks for skills he/she is proficient in
• The wielder gains +1 to AC
• The Amulet gains 3 more charges and the spells may now be 6th level or lower

Exalted State: When the Amulet reaches Exalted State it gains the following properties

• The regeneration ability increases to 2d10 healing
• The AC bonus increases by +3
• The Amulet now has 15 charges and can cast up to 9th level spells, also the amulet may now cast ice, ooze, ash, lightning, or magma-based spells. Lastly, the wielder also gains the ability to cast the Gate spell by expending 9 charges from the Amulet 

Destroying the Amulet:  The Amulet can only be destroyed by the hands of the mightiest gods