Arctic Crown

Touching a willing creature, you bestow upon it an Arctic blessing that manifests as a white, icy helm with a single central eye. For the duration of the spell, the creature gains the following features:

• Immunity to psychic, glacial, incinerating, luminary, lunar, and noctiferous damage;
• The creature becomes immune to debilitating effects and doesn’t need to breathe;
• The creature’s AC gains a bonus equal to half the caster’s proficiency bonus;
• The creature is under the effect of the true sight spell;
• Immunity to True Ice effects;
• The creature’s melee attacks deal an additional 3d6 glacial damage;
• Critical melee hits inflict 1 Freezing marker.
• The creature can use one of its attacks to fire a ray through the central eye, making a ranged attack roll with a range of 60 feet that deals 4d6 glacial damage (critical 19 x3).

When the spell ends, or when concentration is broken, the creature gains 2 points of exhaustion and regains 4d6 hit points.