Tet can use an action to unleash his fallen celestial nature for 1 minute. His eyes and mouth become voids of shadow, and nearby creatures within 10 feet that can see him must succeed on a Charisma saving throw against his spell save DC or become frightened until the end of Tet's next turn. Once during this transformation, Tet can deal extra necrotic damage to one target when he deals damage with an attack or spell, equal to his level, for 5 extra necrotic damage. He can use this feature once per long rest.

Tet wreathes a creature in infernal flame. The target makes a Dexterity saving throw and takes 3d6 fire damage on a failure, or half as much on a success. Tet can use a bonus action on later turns to repeat the damage.

Tet conjures a spectral weapon that attacks a creature within range and can be moved and used to strike again as a bonus action on subsequent turns.

Tet fires a beam of crackling force. He makes a ranged spell attack using his spell attack bonus. On a hit, the target takes 1d10 plus 3 force damage.

Tet commands a creature to flee, approach, drop an object, or take another limited action by issuing a one-word command. The target makes a Wisdom saving throw.

Tet hurls a mote of flame that explodes on impact, dealing 3d6 fire damage in a small radius with a Dexterity saving throw for half damage.

Tet wraps a creature in binding magical force. The target makes a Wisdom saving throw or becomes charmed, restrained, and unable to attack Tet while the spell lasts, with additional saves allowed under its conditions.

Tet can cast warlock spells using Charisma. He knows three cantrips and six warlock spells, and he regains his spell slots after a short or long rest.

Tet is bound to a fiendish patron, an infernal power that grants him destructive magic in exchange for influence, souls, or future service. When he reduces a hostile creature to 0 hit points, he gains temporary hit points equal to 5 plus his Charisma modifier, for a total of 8 temporary hit points.

Tet has learned the eldritch invocation Agonizing Blast, adding his Charisma modifier to the damage of each beam of eldritch blast. He also knows Book of Ancient Secrets. His Pact of the Tome allows him to record two 1st-level ritual spells in his Book of Shadows and cast them as rituals.

Tet's patron grants him a Pact Boon. He possesses a Book of Shadows containing three additional cantrips from any class: guidance, thaumaturgy, and spare the dying.

Tet has learned to perform the basic functions of a chosen profession, including religious rites, and can communicate with a familiar spirit through his Book of Shadows.

Tet has gained one additional level-appropriate warlock spell slot. His Pact Magic spell slots are 3rd level and he has two of them.

Tet has learned the Eldritch Mind invocation, granting him advantage on Constitution saving throws made to maintain concentration on a spell.

Tet can usually secure a place to stay and basic support from temples or religious communities associated with his faith or celestial traditions, provided he demonstrates a genuine connection to the religion.