Belias, the Gigas

Aspect of Flames. Belias is an Aspect of flames, granting his fire the ability to bypass fire resistance and immunities with his attacks and abilities.

Fire Absorption: Whenever Belias is subjected to fire damage, it takes no damage and instead regains a number of Hit Points equal to the fire damage dealt.

Flames of Ruin. Belias’s flames cause ruin and destruction to anything they touch. When a creature is subject to Belias’s flames, Roll a dice type equal to the amount of equipped gear, whatever the die lands on apply a Ruin stack to that piece of gear. Once that piece of gear gets 3 stacks of Ruin, that gear piece in disintegrated.

Soul Burn. If Belias does more then 35 fire damage to a creature, they cannot recover hit points until the end of his next turn, Additionally, if he brings a character’s HP to 0, he destroys the body as it is turned to ash and their soul is sent to hell. Only a wish or true resurrection can bring them back.

Immutable Form: Belias is immune to any spell or Effect that would alter its form.

Legendary Resistance (5/Day). If Belias fails a saving throw, he can choose to succeed instead.

Innate Spellcasting. Belias is a 20th level wizard. Its spellcasting ability is intelligence (spell save DC 23, +16 to hit with spell attacks additionally, spells casted by Belias applies a Ruin stack. ). Belias has following spells prepared: 

(at will): Fireball, Ashardalon’s Stride, Flame Blade
5/day: Immolation, Incendiary Cloud

3/day: Meteor Swarm, Prismatic Wall

Multiattack. You can Target a single creature and make three strikes against that creature. Two with your staff and the third with a ranged fireblast from the staff.

Staff of Belias. Melee Weapon Attack: +16 to hit, reach 10 ft., 1 target. Hit: 18 (2d10 + 10) fire damage. This attack applies a Ruin stack.

Fire Blast (Staff of Belias). Ranged magical Attack: +16 to hit, range 80/120 ft., 1 target. Hit: 22 (4d6 + 10) fire damage. This attack applies a Ruin stack.

Empower Inner Flames(Returns on a 5/6). Next fire spell that Belias casts does max damage.

Flash Fire. Belias erupts in flames, all targets in 10 feet take 2d6 fire damage and teleport to a range in 60 feet that he can see.

Empowered Hellish Rebuke. You point your finger, and the creature that damaged you is momentarily surrounded by hellish flames. The creature must make a Dexterity saving throw. It takes 4d10 fire damage on a failed save, or half as much damage on a successful one.

Aegis of Flame. Belias shields himself in dense flames, increasing his AC by 5 till the end of his next turn. Creatures that would strike this shield take half of the damage they would have inflicted back as fire damage.

Belias can take 5 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature’s turn. Belias regains spent legendary actions at the start of his turn.

Move (Costs 1 action). Use your movement towards a location of your choice.

Attack (Cost 2 actions). Use one of your attack actions against a creature.

Cast Spell (Cost 3 Actions). Belias can cast one of his spells.

Delayed Painflare(Costs 4 Actions). Belias channels his primal Fire in his being over the course of one minute during the turn he activates This ability it’s damage starts at 4d12, and gains a additional damage die per round. Should Belias break concentration or concentrate throughout the whole time of a minute he explodes in a wave of fire all creatures within 120 feet radius of him.Creatures must make dexterity saving throw (23 DC), should they fail they take full damage, if they succeed they take half. Creatures that take damage from this ability take two ruin stacks.

Hellflare (Costs 5 actions). Raising his staff into the air, Belias summons a massive ball of fire that is absorbed into the staff. He then brings the staff down knocking it into the ground as the ground begins to open and chasms begin to form, causing eruptions of lava and plumes of fire to spell within 120 feet around Belias. These irruption‘s go 30 feet into the air and can hit flying creatures. All creatures in the area must make a dexterity saving throw (DC 23). Should they fail, they take 12d8 fire damage and at random one of their magical items equipped is destroyed. Should they pass, they take half damage and the magical items are not destroyed.

Belias can select a single creature at the end of each round to do the following ability.

Devil’s Word (Once per round). Belias targets a single creature at random, to instantly transport the target through the lower planes. The creature disappears and hurtles through a nightmare landscape.

At the end of Belias’s next turn, the target returns to the space it previously occupied, or the nearest unoccupied space. If the target is not a fiend, it takes 10d10 psychic damage and 10d10 fire damage as it reels from its horrific experience.