You've learned to meld your strikes with sparks of arcane magic, gaining the following benefits:

• You gain proficiency with one martial melee weapon of your choice.
• When you deal bludgeoning, piercing, or slashing damage with a melee weapon, you can change the damage to your choice of acid, cold, fire, or lightning damage.
• You learn two cantrips of your choice from among the following: arc blade, burning blade, caustic blade, and frigid blade.
• You can cast the shield spell once without using a spell slot. Once you cast this spell using this feat, you can't do so again until you finish a long rest.