Arcane Assimilate

The magic flowing through your veins allows you to absorb magic and use it for your own purposes. 

• You gain resistance to poison damage.
• On a successful save against a spell you gain the ability to cast that spell as an action by using sorcery points equal to half the spell's level. The learned spell lasts until your next long rest. 
• If you take damage from a spell or magical effect you may spend 2 sorcery points as a reaction to gain resistance to the damage type taken. If the spell deals multiple types of damage you may choose which one to become resistant to. The resistance lasts until your next long rest.