Crimsonpyre Drakeling (ELG)

Flyby. The drakeling doesn't provoke opportunity attacks when it flies out of an enemy's reach.

Crimson Smog. As long as the drakeling is not incapacitated, hostile creatures within 5 feet of it gain vulnerability to acid damage unless they have resistance or immunity to such damage.

Burn Forever. When the drakeling is subjected to fire damage, it can’t use its Legendary Multiattack until the end of its next turn.

Lasting Burns. Fire damage dealt by this drakeling is removed from each creature’s maximum hit points. A creature’s maximum hit points cannot be reduced below 1 by this dragon’s fire damage. A creature regains lost maximum hit points equal to its proficiency bonus at the end of each long rest.

Legendary Multiattack. The drakeling makes one Coat With Crimson attack and either three Ignite attacks or two Crimsonpyre attacks.

Multiattack. The drakeling makes one Bite attack and either two Ignite or Crimsonpyre attacks, or one Coat With Crimson attack.

Bite. Melee Weapon Attack: +5 to hit, reach 10 ft., one target. Hit: 8 (2d6 + 2) piercing damage, and an additional 1 (1d4) fire damage if the target is coated in crimson acid. If the drakeling misses, it can move or fly up to 10 feet. This movement doesn't provoke opportunity attacks.

Coat With Crimson. The drakeling flings red, sticky acid from itself in all directions. All creatures within 20 feet of the drakeling must make a DC 15 Constitution saving throw or are coated in the acid, and take 2 (1d4 + 1) acid damage at the begin of each of their turns. A creature is no longer considered covered in acid if it starts its turn further than 50 feet from the drakeling, or the drakeling is unconscious.

Crimsonpyre. Ranged Breath Attack: +6 to hit, range 20/120 ft., one target. Hit: 5 (1d6+2) acid damage. If the target is a creature, it must make a DC 15 Constitution saving throw or take an extra 16 (2d12 + 4) fire damage.

Ignite. All creatures coated in crimson acid within 30 feet of the drakeling must make a DC 10 dexterity saving throw or take 6 (2d4 + 2) fire damage.

Branding Acid. The drakeling may use a bonus action to mark a creature that it has damaged. Only one creature can be marked at a time. The drakeling always knows the exact location of the marked creature on the current plane of existence, cannot be surprised by it, and has advantage on all attack rolls against it.