Alex

Chameleon Skin. Alex has advantage on Dexterity (Stealth) Check made to hide.

Innate Spellcasting (Abomination Form Only). Alex's Innate spellcasting ability is Charisma (spell save DC 17). Alex can innately cast the following spells prepared, Requiring no material Components:

At Will: Animal Friendship (snakes only), Hunters Mark
3/day: Suggestion
1/day: Fear

Legendary Resistance (1/Day). If Alex Fails a saving throw, she can choose to succeed instead.

Magic Resistance. Alex has advantage on saving throws against spells and other magical effects

Otherworldly Perception. Alex can sense the Presence of any creature within 30 feet of her. if that creature is Invisible or on the Ethereal Plane. She can pinpoint such a Creature that is moving.

Shapechanger. Alex can use her action to polymorph into a large snake or back into her true form. her statistics remain the same in each form. Any equipment she is wearing or carrying isn't transformed and. she doesn't change form if she dies.

Shrouded Prescense. Alex is immune to any effect that would sense her emotions or read her thoughts.

Multiattack (Abomination Form Only). Alex Makes  3 Melee attacks. But can use Her Bite and Constrict attacks Only once. or 2 Two-Handed Slashers Axe Attacks

Bite. Melee Weapon Attack: +9 to hit, reach 5 ft., 1 target. Hit: 7 (1d6 + 4) Piercing damage. plus 10 (3d6) Poison Damage 

Constrict. Melee Weapon Attack: +9 to hit, reach 10 ft., 1 target. Hit: 11 (2d6 + 4) Bludgeoning damage. and the target is Grappled (escape DC 14). Until this grapple ends the target is Restrained, and Alex can't constrict another target.

Slashers Axe. Melee Weapon Attack: +9 to hit, reach 5 ft., 1 target. Hit: 8 (1d8 + 4) Slashing damage or 9 (1d10 + 4) Slashing Damage if used with two hands.
If using two hands Alex adds 21(6d6) Necrotic Damage. if the Target is a Creature, it suffers a Lingering wound that causes it to take 2 (1d4) necrotic damage at the start of each of its turns, each time Alex hits the wounded target with this attack, the damage dealt increases by 2 (1d4). the Wound ends if the target regains hitpoints or if a creature uses an action to staunch the wound which requires a Successful DC 17 Wisdom (Medicine) Check

Snake Antipathy. Alex targets a Creature she can see within 60 feet of her. the target.must succeed on a DC 17 Wisdom Saving throw or Feel an Intense Urge to Avoid Snakes or Snakelike Creatures (Including Yuan-ti) As if under the effect of the Antipathy Spell.

Alex can cast the Hunters Mark spell as a Bonus Action

Alex can take 2 legendary actions, Choosing from the options below. Only 1 legendary action can be used at a time and only at the end of another creature's Turn. Alex Regains All spent Legendary Actions at the start of her turn

Seperation. Alex Forces a Creature she can see to teleport to an Unoccupied space she can see within 30 feet, A Creature can Resist if they Succeed on a DC 22 Wisdom Save

Slashers Axe. Alex Makes 1 Slashers Axe Attack 

Surprise Constriction (Costs 2 Actions). Alex teleports behind a Creature she can See within 30 feet of her (provided the space is Unoccupied) and uses a Constrict Attack