Cindervane (Infested)

Parasitic Infection.
A Parasite is physically fused to Cindervane and is part of his body. Cindervane gains Immunity to Poison damage and the Poisoned effect. The parasite cannot be targeted as a separate creature while fused to Cindervane's body. When Cindervane reaches 100hp it can activate it's mythical action Infestation Take Over.

Effects that cure disease, remove curses, or expel parasites do not immediately remove her, but causes any of Cindervanes mythical and legendary attacks to have disadvantage until the end of it's next turn.

Roll 2D12, the creature has, X Cinderling Egg sacs hidden beneath some of it's scales, they can be targeted and have an AC 18 and 5hp, As an Action Cindervane can consume the eggs restoring 1D10hp per egg consumed, having a pool of how many eggs were rolled or remaining at the time. If Cindervane does a Cinder Press Attack roll 1d4 for rupturing eggs dealing 1d4 additional  acid damage per egg on any creature that fails the attacks DC. 

Brood Rupture.
At the beginning of Cindervane's turn one of the egg sacs on it's body ruptures and a Cinderling appears within 5 feet of Cindervane, it can immediately use it's reaction to move 15ft toward the closest enemy.

Multiattack. The dragon makes two attacks: two with it's claws or one claw and one other.

Bite. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 14 (2d8 + 5) piercing damage plus 3 (1d6) fire damage. If a Cinderling is grappling a target, it explodes healing Cindervane for damage dealt.

Claw. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 9 (2d4 + 5) slashing damage.

Cinder Press. 
If the Dragon is in the air add an additional d10 per 20ft of movement made. The dragon must be able to make the full distance with it's fly speed. The dragon reals on it's hind legs and Slams it's body into the ground in a 10ft radius. Each creature in that area must make a DC 15 Dexterity saving throw, taking 32 (2d10) bludgeoning damage on a failed save and creatures are pushed back 10ft, or half as much damage on a successful one and no movement.

Fire Breath (Recharge 5–6). The dragon exhales fire in a 30-foot cone. Each creature in that area must make a DC 15 Dexterity saving throw, taking 32 (8d6) fire damage on a failed save, or half as much damage on a successful one.

Parasitic Whip (Requires Infestation Take Over)
Ranged Weapon Attack: +8 to hit, reach 20 ft., one target. Hit: 9 (1d10 + 5) bludgeoning damage. Cindervane can forgo the damage to instead grapple a creature with the tendril.

Tendril Breath (Requires Infection Take Over) (Recharge 5–6). The dragon exhales Tendrils in a 30-foot cone. Each creature in that area must make a DC 15 Dexterity saving throw, taking 21 (2d8) bludgeoning damage plus 12 (3d6) Acid damage on a failed save and is pulled 10ft toward Cindervane, or half as much damage on a successful one and no movement.

Infection Injection (Requires Infestation Take Over)
A Creature grappled by one or more Parasitic Whips must make a DC15 Constitution saving throw on a failure they grow a large mass in their back taking 1d6 piercing damage. At the end of their next turn a Cinderling will rupture from their growth and appear within 5 feet of the target taking 3d6 slashing damage. A creature within 5ft of the target can use an action to pierce in the egg, dealing 1d6 damage to the target ending the infection.
On a Success the target takes 1d6 piercing damage but is not infested.

Submerge.
If Cindervane is within 5ft of a hot spring he can dive into it creating a 20ft cloud of steam within the entry point until the beginning of it's next turn. This cloud is treated as Heavily Obscured. This Bonus action does not provoke opportunity attacks.

Cindervane has 2 Legendary Reactions each round, regaining them at the beginning of his turn.

Claw.
Cindervane may make one Claw Attack.

Consume the Brood.
Cindervane can consume an egg within 10ft of it or on it's body regaining 2D8hp.

Spell Fed Parasite (Once Per Round, Requires Infestation Take Over)
As a reaction, when a creature within 30ft a spell of 1st level or higher misses Cindervane its parasite can absorb the spell regaining 4d6HP and hatch 1d8 egg sacs on it's body from the energy of the spell, those Cinderlings will appear within 5ft of Cindervane. 

Brood Shield. (Requires Infestation Take Over)
As a reaction When Cindervane is targeted by a ranged attack it sheds some of the overgrown flesh right before to take the blow dealing 1d4 force damage to her but giving it +5 AC.

Infestation Take Over.
When Cindervane is reduced to 100hp it lets out a loud two toned roar any creature within 120ft that can hear it's roar must make a DC 15 Charisma saving throw or be frightened until the end of their next turn as they hear the pain and anger of the dragon being taken over by the parasite. It's flesh begins to bubble and puss past the hardened scales oozing black oil and flaking off in chunks. Cindervane gains the following traits.

Brittle Flesh.
Cindervane gains resistance to non magical bludgeoning, slashing, and piercing attacks, made with non adamantine weapons, and vulnerable to Cold damage. When Cindervane is dealt cold damage, it cannot use reactions until the beginning of it's next turn.
A creature who starts it's turn within 5ft of it while it's under the Infection Take Over makes a DC15 Dexterity saving throw, on a failure they take 1d4 Acid and 1d4 Necrotic damage from molting and oozing flesh.
On a Success they take no damage.

Parasitic Tendrils.
Cindervane starts to sprout wriggling tendrils from under it's nails and behind it's scales it gains the Parasitic Whip which it can use instead of it's claw attacks and Tendril Breath Attacks. Also any attack that dealt additional fire damage now deals Acid damage.

For the Horde.
At the start of Cindervane's turn two eggs will hatch Cinderlings instead of one.