As a Bonus Action, ThunderBird sprouts spectral lightning-blue wings for 10 minutes, gaining a Fly Speed equal to his Speed. The wings end early if he retracts them or becomes Incapacitated. Once used, this trait cannot be used again until a Long Rest.

As a Magic action, ThunderBird presents his Holy Symbol and expends a Channel Divinity use to focus divine energy on a creature within 30 feet. The target makes a Constitution saving throw. On a failed save, it takes 1d8 + 2 Radiant damage, or regains 1d8 + 2 Hit Points. On a successful save, it takes half damage and cannot regain Hit Points from this effect.

As a Magic action, ThunderBird presents his Holy Symbol. Each Undead within 30 feet that can see or hear him must succeed on a Wisdom saving throw or become Frightened and Incapacitated for 1 minute, taking the Dash action and moving away if possible. Failed Undead also take Radiant damage from Sear Undead.

As a Magic action, ThunderBird presents his Holy Symbol and expends a Channel Divinity use to restore up to 30 Hit Points divided among Bloodied creatures within 30 feet. No target can be restored above half its Hit Point maximum.

When ThunderBird takes the Attack action, he can replace one attack with a 15-foot Cone or 30-foot Line, 5 feet wide. Creatures in the area make a DC 12 Dexterity saving throw, taking 2d10 Lightning damage on a failure or half damage on a success. He can use this feature three times per Long Rest.

You can cast prepared Cleric spells using Wisdom as your spellcasting ability. You can use a Holy Symbol as a spellcasting focus. You have four Cleric cantrips and can prepare eight Cleric spells, not counting your Life Domain spells.

Protector. You gain proficiency with Martial weapons and Heavy armor.

You have two uses of Channel Divinity, and regain one expended use after a Short Rest and all expended uses after a Long Rest. You can use Channel Divinity for Divine Spark or Turn Undead.

Divine Spark. As a Magic action, present your Holy Symbol and expend a Channel Divinity use to focus divine energy on a creature within 30 feet. The creature makes a Constitution saving throw. On a failed save, it takes Radiant damage equal to 1d8 plus your Wisdom modifier, or regains Hit Points equal to 1d8 plus your Wisdom modifier. On a successful save, it takes half damage and cannot regain Hit Points from this effect. Turn Undead. As a Magic action, present your Holy Symbol. Each Undead within 30 feet that can see or hear you must succeed on a Wisdom saving throw or have the Frightened and Incapacitated conditions for 1 minute, while also taking the Dash action and moving away from you if possible.

You gain the Life Domain subclass. You gain its Disciple of Life, Life Domain Spells, and Preserve Life features.

You gain the Ability Score Improvement feat. ThunderBird has selected the Ability Score Improvement feat without changing his provided final ability scores.

Whenever you use Turn Undead, roll a number of d8s equal to your Wisdom modifier, minimum one die, and add the result together. Each Undead that fails its saving throw against that use of Turn Undead takes Radiant damage equal to the total. This damage does not end the Turn Undead effect.

You can use Channel Divinity twice between rests. Preserve Life uses one Channel Divinity use and restores up to 30 Hit Points divided among Bloodied creatures within 30 feet, including yourself. No creature can be restored above half its Hit Point maximum by this feature.

When you cast a spell with a spell slot that restores Hit Points to one or more creatures other than yourself, you regain Hit Points equal to 2 plus the spell slot's level.

When you cast a spell with a spell slot that restores Hit Points to a creature, the creature regains additional Hit Points equal to 2 plus the spell slot's level on the turn you cast the spell.

Military Rank. ThunderBird retains his rank and the respect of soldiers who served under or alongside him. He can invoke that rank to exert influence over other soldiers, recognize military organizations and their customs, and request simple aid from those familiar with his former command.