Colágion the Parasitic Vine Hive

Colossal Plant: Colágion the Parasitic Vine Hive is a colossal plant creature composed of several parasitic vines, and their hosts, it ocupies the ruins of the city of H´Kuáa, being at least 3 miles wide and 3 miles long and 200ft tall.

Siege Monster: Colágion is a enormous vegetal creature it deals twice as much damage to structures.

Druidic Misteries: Colágion´s connection with nature allows it to cast druidic magic, it is considered a 17th level spell caster, and has a spell attack roll bonus of +17 and a spell save DC of 25 and is able to cast any druid spell it has spell slots available to cast them with.

It may cast any number of spells at will other than 7th, 8th and 9th level spells wich it has 4,3 and 2 spell slots respectivly.

Photosinthesis: While Colágion is in contact with soil and it has not taken fire damage since its last turn it regains 200 hit points, it regains only 100 if it has taken fire damage since its last turn, or if it is not in contact with soil. 

Flora Flow: Colágion is a stationary plant, however it can slowly alter its position by uprooting and rooting again its massive composite body, it can move up to 30ft in 1 hour.

Puppetiered Army: Colágion commands hundreds of corpses of animals and harpies with thier parasitic vines and growths each of this takes their action right after Colágion´s turn and they obey Colágion´s order to the best of their ability and not regarding their own survivability.

Shape Change: Colágion is able to alter the shape of its body, it always resembles a pile of vines and corpses however it can stretch and condense its area potencialy increasing its hight or with.

it can once per turn (taking the actions of 20 of its composit parasitic vines) change its shape by up to 250ft (potencialy reaching airborne creatures in a flash of recomposition).

Labarintine Mind: Colágion is a hive mind of parasitic vines and their hosts it is immune to any condiiton that would alter its mind short of divine intervention.

every single parasitic vine that composes Colágion has to be targeted and affected for effects that would force it to act against its will to resolve.

Whenever a creature attempts to read its thoughts or otherwise probe its mind it must succeed in a DC 25 Wisdom saving throw taking 20d10 psychic damage on a failure, half as much on a success. 

Regardless of a success or failure the information gathered is a incomprehensible compressed thoughts of dozens of intertwined parasitic vines.

Multiplicity: Colágion is a composit of several creatures, as such effects that would target a single individual fail to take complete effect instead it loses 5 maximum hit points, (example Banishing it would instead remove one of its parasitic vines).

Colágion takes twice as much damage from area of effect damage.

Horde of Minds: Colágion can make up betwen one and one hundred actions with its central body during its turn, this is considered as if each one of the diferent parasitic vines that compose it performed the action, moving will take an action and they can cast any number of spells or make any number of single attacks for each of the parasitic vines that compose Colágion that choose to act.

Casting spells this way uses 1 available action for the level of spell slot used (lvl 4 spell costs 4 actions).

Thorny Vine (5 actions): Melee Weapon Attack +17 to hit, all targets within the space ocupied by Colágion and within 15ft of it, for 4d12+8 piercing damage + 2d10 bludgeoning damage.

A creature hit by two or more Thorny Vine attacks must succeed in a DC 25 Dexterity or Strength saving throw being restrained by the vines on a failure.

A creature restrained in this way may attempt to break free as an action by succeeding in a DC 25 Strength saving throw breaking free on a success.

Crushing Vines: Colágion deals 1d10 bludgeoning damage + 1d10 piercing damage to a creature restrained by its vines. 

Colágion is a legendary creature a unique of its species with great age and skill of nature magic and puppetiering of its thralls, it has 3 legendary actions, wich it regains at the start of its turn.

Detect: Colágion attempts to percieve its surroundings, it can do a perception skill check or otherwise seek weaknesses in their foes.

Natural Magic (2 Action): Colágion casts one spell of 3rd level or lower with casting time of an action or bonus action.