Cleric of the Favoured Soul

Cult Master. As a bonus action, the favoured soul can expend a spell slot to cause the melee weapon attacks of allies within 60 feet to magically deal an extra 7 (2d6) radiant damage to a target on a hit. This benefit lasts until the end of the turn. If the favoured soul expends a spell slot of 4th level or higher, the extra damage is 10 (3d6) per hit.
Legendary Resistance (1/day). If the favoured soul fails a saving throw, it can choose to succeed instead.
Spellcasting. The Favoured Soul is a 15th-level spellcaster. Its spellcasting ability is Wisdom (spell save DC 18, +10 to hit with spell attacks). The favoured soul has the following cleric spells prepared:
 Cantrips (at will): Guidance, light, resistance, spare the dying, thaumaturgy
 1st level (4 slots): Bless, divine favour, healing word, heroism, protection from evil and good
 2nd level (3 slots): Enhance ability, hold person, lesser restoration, magic weapon, spiritual weapon
 3rd level (3 slots): Beacon of hope, crusader's mantle, magic circle, mass healing word, spirit guardians
 4th level (3 slots): Aura of purity, banishment, death ward, divination, guardian of faith
 5th level (2 slots): Circle of power, dispel evil and good, dominate person, flame strike
 6th level (1 slot): Blade barrier, harm, heal
 7th level (1 slot): Divine word, symbol
 8th level (1 slot): Holy aura

Multiattack. The favoured soul makes two divine spear attacks.
Divine Spear. Melee weapon attack: +8 to hit, reach 5ft., one target. Hit: 7 (1d8+3) piercing damage and 7 (2d6) radiant damage.

Exert Will. As a reaction when making an ability check or saving throw, the favoured soul can gain a +10 bonus.

Legendary Resistance (1/day). If the favoured soul fails a saving throw, it can choose to succeed instead.