Category 5 Drakewing Krasis

Amorphic. The Krasis is able to change shape in order to fit through spaces 1 inch thick at smallest. The Krasis always changes shape to fit into its surroundings. There are 3 specific amorphic forms available to the Krasis that affect its AC and max HP. All HP loss is carried over from the previous amorphic shape, even if this would result in the death of a Krasis. 

TINY (mouse-sized) - Max HP: 30, AC: 24. When tiny, the Krasis deals quarter damage.

MEDIUM (humanoid) - Max HP: 100, AC: 23. When medium, the Krasis deals half damage.

GARGANTUAN (base size) - Max HP: 300, AC: 22.

Death From Above. When the Krasis attacks a grounded unit whilst flying, add an extra 8d6 to the damage roll. Additionally, after attacking a grounded movement, the Krasis can move its full flying movement again, once per turn.

Airborne Creature. When grounded, all attacks upon the Krasis have advantage and upon a hit automatically score a critical hit.

Regenerative. At the start of each of its turns, the Krasis regains 10% of the max HP of its current amorphic form. Additionally, once a Krasis has been reduced to 0 HP, if any body parts are left intact the Krasis can regenerate fully from the body part over 24 hours.

Siege Monster. The Krasis deals triple damage to constructs.

Multiattack. The Krasis makes 2 attacks with its claws, OR makes a single fireblast attack.

Claws. Melee Weapon Attack: +10 to hit, reach 5 ft., 1 target. Hit: 28 (6d6 + 10) piercing damage. 

Fireblast (Recharge 3 turns). Each creature in a 50ft cone in front of the Krasis makes a dex save (DC 17). Take 45 (9d10) fire damage on failure, or half for a successful save..