Crimson Guardian Gurenlagen

Legendary Resistance (3/Day). If the Gurenlagenn fails a saving throw, it can choose to succeed instead.

Antimagic Presence. An aura, such as in Antimagic Field surrounds Gurenalgen in a 30 ft. sphere. However, Gurenlagen is unaffected by this aura, and magic weapons are also unaffected.

Regeneration. Gurenalgen regains 30 hit points at the start of his turn.

Burning-Gold Horn Twinblades. Gurenlagen, in human form, removes his horns, that become the Legendary Weapons, the Burning-Gold Horn Twinblades

Mortal Gem. Gurenlagen possesses the Mortal Gem, an artifact that allows him to become half-humanoid or full humanoid, without knowing magic.

Multiattack (Dragon Form). Crimson Guardian Gurenlagen can use its Frightful Presence. It then makes three attacks: one with its bite and two with its claws.

Burning Bite. Melee Weapon Attack: + 17 to hit, reach 15 ft., one target. Hit: 21 (2d10 + 10) piercing damage plus 14 (4d6) fire damage.

Claw Swipe. Melee Weapon Attack: +17 to hit, reach 10 ft., one target. Hit: 17 (2d6 + 10) slashing damage.

Tail. Melee Weapon Attack: +17 to hit, reach 20 ft., one target. Hit: 19 (2d8 + 10) bludgeoning damage.

Frightful Presence. Each creature of the Gurenlagen’s choice that is within 120 feet of the dragon and aware of it must succeed on a DC 21 Wisdom saving throw or become frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature’s saving throw is successful or the effect ends for it, the creature is immune to the Gurenlagen’s Frightful Presence for the next 24 hours.

Fire Breath (Recharge 5–6). Gurenlagen exhales fire in a 90-foot cone. Each creature in that area must make a DC 22 Dexterity saving throw, taking 91 (13d12) fire damage on a failed save, or half as much damage on a successful one.

Meteoric Dive-Bomb (Recharge 5-6). If Gurenlagen is in the air, he is able to dive bomb the ground. Any creatures hit point blank by his attack take 27 (3d12 + 9). Any creatures within 30 ft (Circle) of the impact point, must make a DC 24 Dexterity saving throw, taking 115 (16d12) fire damage on a failed save and being knocked prone.

Multiattack (Humanoid Form). While in human form, and wielding the Burning-Gold Horn Twinblades, Gurenlagen attacks four times, with each edge of the Twinblade.

Twinblade Slice. +17 to hit, reach 10 ft. one target. Hit: 15 (2d8 + 7) slashing damage plus 1d6 fire damage.

Crimson Guardian Gurenlagen can take 3 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. Gurenlagen regains spent legendary actions at the start of its turn.

Detect. The dragon makes a Wisdom (Perception) check.

Tail Attack. The dragon makes a tail attack.

Wing Attack (Costs 2 Actions). The dragon beats its wings. Each creature within 15 feet of the dragon must succeed on a DC 25 Dexterity saving throw or take 17 (2d6 + 10) bludgeoning damage and be knocked prone. The dragon can then fly up to half its flying speed.

Burning Dragon Spirit (Costs 3 Actions). If Earthborn Durek dies, his spirit enters Gurenlagen, and in exchange for losing 3d10 health points every turn, all of Gurenlagen's attacks deal an extra 4d8 fire damage and have an extra range of 20 ft.

Humanisation (Costs 3 Actions). If Heavensent Neura dies, Gurenlagen activates the Mortal Gem and transforms into a human. It also turns its horns into the Burning-Gold Horn Twinblades. While human, Gurenlagen still possesses wings, capable of flight.