Chosen One

Innate Spellcasting. The warlock’s innate spellcasting ability is Charisma. It can innately cast the following spells (spell save DC 14), requiring no material components:

At will: detect evil and good, mage armor (self only), purify food and drink

1/day: revivify

Spellcasting. The warlock is a 5th-level spellcaster. Its spellcasting ability is Charisma (spell save DC 14, +5 to hit with spell attacks). It regains its expended spell slots when it finishes a short or long rest. It knows the following warlock spells:

Cantrips (at will): spare the dying, light, word of radiance

1st–3rd level (2 3rd-level slots): cure wounds, calm emotions, guiding bolt, daylight, lesser restoration, magic circle

Longsword. Melee Weapon Attack: +3 (+6 when raging) to hit, reach 5 ft. Hit: 4 (1d10 + 2) slashing damage or Hit: 6 (1d6 + 4) radiant damage when raging. 

Dagger. Melee or Ranged Weapon Attack: +3 to hit (+6 when raging), reach 5 ft. or range 20/60 ft., one target. Hit: 4 (1d4 + 2) slashing damage or Hit: 6 (1d4 + 4) radiant damage when raging. 

Divine Smite. As a bonus action, the Chosen can expend a spell slot to cause its melee weapon attacks to magically deal an extra 10 (3d6) radiant damage to a target on a hit. This benefit lasts until the end of the turn.

Divine Rage. After taking fatal damage, The Chosen as a reaction can submit to its angelic patron and become possessed by a spirit of justice. The Chosen gains 25 temporary hit points before it takes the damage and gains the divine retribution ability. 

While raging, The Chosen gains the following benefits providing it isn't wearing heavy armour:

• The Warlock has advantage on Strength checks and Strength saving throws.
• When it makes a melee weapon attack using strength, it can instead use its charisma (+4) for the attack and damage which is always radiant.
• The Chosen gains resistance to bludgeoning, piercing, and slashing damage vs. non-magical weapons. 

The Chosen is unable to cast spells or maintain concentration when raging but can still use divine smite and [spell]Thaumaturgy[spell] as a bonus action on each of its turns while she speaks with the voice of a celestial. The rage lasts for 1 minute or ends when the chosen loses its tempory hit points. The divine rage ability forces the warlock to lose control of its mine in favour of its celestial host and attacks with the tenacity of an angelic warrior. 

Divine Retribution. While raging, The Chosen as a reaction can use her divine retribution ability after taking damage. The attacker must succeed a strength saving throw vs. a DC that is equal to 5 + the tempory hit points lost on a fail the target is pushed back 5ft for every 5 damage dealt, knocked prone and takes damage equal to the tempory hit points lost. On a success, the target takes half damage, is knocked back 5ft but does not fall prone.