Eldritch Shield

You conjure an otherworldly shield of chaotic Eldrazi energy that envelops you in a protective aura. Until the start of your next turn, you gain a +5 bonus to AC, including against the triggering attack, and you take no damage from magic missile.

Additionally, while the Eldritch Shield is active, any creature that hits you with a melee attack takes force damage equal to your Charisma modifier (minimum of 1 damage).

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the force damage increases by 1 for each slot level above 1st.