Lahnis

When Lahnis casts an evocation spell that forces other creatures it can see to make a saving throw, it can choose a number of them equal to 1 + the spell's level. These creatures automatically succeed on their saving throws against the spell. If a successful save means a chosen creature would take half damage from the spell, it instead takes no damage from it.

Lahnis wears a ring of protection.

Melee Attack Roll: +3 to hit, reach 5 ft., one target. Hit: 2 (1d6 - 1) bludgeoning damage, or 3 (1d8 - 1) bludgeoning damage if used with two hands.

Lahnis is a 12th-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 15, +7 to hit with spell attacks). Lahnis has the following wizard spells prepared:

Cantrips: fire bolt*, light*, prestidigitation, ray of frost*

Level 1 (4 slots): burning hands*, mage armor, magic missile*

Level 2 (3 slots): mirror image, misty step, shatter*

Level 3 (3 slots): counterspell, fireball*, lightning bolt*

Level 4 (3 slots): ice storm*, stoneskin

Level 5 (2 slots): Bigby's hand*, cone of cold*

Level 6 (1 slots): chain lightning*, wall of ice*