Sage

Melee Spell Attack +6 to hit (with advantage if the target is wearing armor made of metal), reach 5 ft., one creature. 9 (2d8) Lightning damage, and the target can't take reactions until the start of its next turn.

When the sage is hit by an attack or targeted by a Magic Missile spell, it calls forth an Invisible barrier of magical force that protects it. Until the start of its next turn, the sage has a +5 bonus to AC, including against the triggering attack, and it takes no damage from magic missile.