Mana Battery
Your body has become a self sustaining reservoir of magical potential. You gain a pool of spell charges equal to your 6 + Charisma modifier + Proficiency Bonus. You can expend these charges to fuel any spell you know or can cast that has a casting time of 1 action or less, provided the spell's level is 10 or lower. Using a charge allows you to cast the spell without expending a spell slot. You regain all expended charges when you finish a long rest.
Harmonic Resonance
Whenever you cast a spell or use a magical ability that deals Force or Necrotic damage, you can tap into the stabilizing vibrations of the stones as a bonus action. When you do so, the potency of the magic increases:
- The Spell Save DC for that effect increases by +2.
- You gain Temporary Hit Points equal to double your character level as the gemstones harmonize your physical form against the magical strain.
Symbiotic Surge
The violet void of the plum stone and the azure frost of the sapphire have achieved a perfect, violent equilibrium. When you use an Empowered Eldritch Blast, you can choose to transmute its fundamental nature. Instead of dealing Force damage, the blast deals Cold damage. If you make this choice, any creature hit by the blast must succeed on a Constitution Saving Throw (against your Spell Save DC) or be inflicted with the Chilled condition, reducing their movement speed by half until the end of your next turn.
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