Azure Weave Gem

Once belonging to a powerful archmage of the Dwenden Empire, now hoarded by the Greatwyrm Terraodin. The Azure Weave Gem was once a dazziling ruby, now warped by the chromatic power housed in the dragon's lair.

Those who attune to this gain advantage on Intelligence (History) checks.

The gem has 3 charges and regains all expended charges daily at dawn. When you cast a spell while holding this gem, you can expend up to 3 charges to ignore the spell’s material components with a gold piece cost, up to 500 gp per charge expended.

When you finish a long rest, choose a spell from any class list. The spell you choose must be of a level you can cast. You know the chosen spell and can cast it with your spell slots of the appropriate level until the end of your next long rest.

Slumbering (Uncommon). You have advantage on initiative rolls. While you are holding the focus, it can function as a spellcasting focus for all your spells.

Stirring (Rare). The Stirring focus has the Slumbering property, and it gains an additional property determined by the family of the dragon in whose hoard it became Stirring:

Chromatic. Whenever you use a spell slot to cast a spell that deals acid, cold, fire, lightning, or poison damage, roll a d6, and you gain a bonus equal to the number rolled to one of the spell’s damage rolls.

Notes: Spellcaster