Cassios the flame

Spellcasting. Cassios the flame is a 16th-level spellcaster. Its spellcasting ability is Wisdom (spell save DC 18, +10 to hit with spell attacks). 

Heliod's Aura (1/day). Divine light washes out from you and coalesces in a soft radiance in a 30-foot radius around you. Creatures of your choice in that radius when you cast this spell shed dim light in a 5-foot radius and have advantage on all saving throws, and other creatures have disadvantage on attack rolls against them until the spell ends. This action requires concentration.

Beacon of hope (2/day). This spell bestows hope and vitality. Choose any number of creatures within range. For the duration, each target has advantage on Wisdom saving throws and death saving throws, and regains the maximum number of hit points possible from any healing. This action requires concentration.

Heal (3/days). Choose a creature that you can see within range. A surge of positive energy washes through the creature, causing it to regain 70 hit points. This spell also ends blindness, deafness, and any diseases affecting the target. 

Heliod's wrath (2/day). You unleash a radiant explosion on a creature that you can see within 60ft range. The target must make a Constitution saving throw. On a failed save, it takes 14d6 necrotic damage, or half as much damage on a successful save

Sacred flame. Ranged Weapon Attack: +10 to hit. Range 60 ft., one target. Hit: 16 (4d8 ) radiant damage.

Healing Words. A creature of your choice that you can see within 30ft range regains hit points equal to 2d4 + 5.

Cure wounds. A creature you touch regains a number of hit points equal to 3d8 + 5.

Divine shield. When you are hit by an attack or you fail a saving throw, you can use your reaction to gain a +2 bonus to your AC against that attack or a +4 bonus to that saving throw.

Celestial rebuke. As a reaction, the creature must make a Dexterity saving throw. It takes 2d10 radiant damage on a failed save, or half as much damage on a successful one.

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