Chithuri Leviathan

Hive Mind. The Hive Mind of the Chitauri puts them under the absolute control of the Hive King, or Queen. allowing them to communicate with any other of their species. they do keep their own individual personalities but cannot disobey an order from their leader. they have an advantage against mind-altering spells and damage types.

Siege Monster. Does double damage to structures.

Heavily armored. its outside is tough and sturdy The leviathan has resistance to nonmagical Psychical attacks. [is removed when the armor is broken]

Magical Flight. The leviathan has a magical flight speed of 45.

Soft Insides. Attacks that reach inside the Leviathan's mouth and further inside it do double damage due to its weak insides.

Fleet Carrier. Due to its large size and the way the armor is built, it can carry 15 Chitauri soldiers on both sides of it. [doesnt work once the armor is broken]

Multiattack. The Leviathan makes two Crunch attacks

Battering Ram. Melee Weapon Attack: +13 to hit, reach Self- 20ft., 1-00 target. Hit: 13 (6d8+7) [Blundgoning] damage.  [ Non-magical]

Crunch. Melee Weapon Attack: +13 to hit, reach 20ft., 1-3 target. Hit: 13 (4d8 + 7) [peircing] damage.  On a 15 or higher and the target is medium or smaller they take an extra 3d6+8 bleed damage. [non-magical]

For 1 Bonus Action. it releases the Chitauri Soldiers it was carrying.

Opportunity Attack. You can make an opportunity attack when a hostile creature that you can see moves out of your reach. To make the opportunity attack, you use your reaction to make one melee attack against the provoking creature. The attack occurs right before the creature leaves your reach.