Fey Ancestry. Advantage on saving throws against being charmed, cannot be put to sleep by magic.

Mask of the Wild. Wrathblight can attempt to hide even when only lightly obscured by foliage, heavy rain, falling snow, mist and other natural phenomena.

Reckless Attack. Wrathblight can gain advantage on melee weapon attack rolls that use Strength or Wisdom during their turn but if they do so, all attacks against them have advantage until their next turn.

Mana Horror. Wrathblight can recover Mana from magical attacks. Whenever Wrathblight takes damage from a spell, magical effect or magic weapon attack, they gain points equal to the number of damage dice rolled. While they have unspent Mana Horror points, they have disadvantage on miscasting and psychogeography saves. When they make a saving throw against a magical effect or spell, they can spend a Mana Horror point to gain advantage on the save. Once they have spent a point in this way, they cannot do so again until the end of their next turn.

Horror of Wrath. While Wrathblight has unspent Mana Horror points, the first weapon or spell attack they hit with on their turn deals lightning damage equal to half their current Mana Horror points rounded down (minimum of 1).

Primal Magic Horror. Whenever Wrathblight casts a spell and they have unspent Mana Horror points, they regain 1d4 hitpoints per level of the spell and lose Mana Horror points equal to the level of the spell or all their remaining Mana Horror points, whichever is lesser.

Spellcasting. Wrathblight is a 9th-level spellcaster. Their spellcasting ability is Wisdom (spell save DC 17, +9 to hit with spell attacks). Wrathblight has the following Druid spells prepared:
Cantrips (at will): Druidcraft, Thorn Whip, Infestation, Chill Touch
1st level (4 slots): Absorb Elements, Create or Destroy Water, Cure Wounds, Entangle, Fog Cloud

2nd level (3 slots): [Blindness/Deafness], [Gentle Repose], Dust Devil, Flaming Sphere, Gust of Wind, Healing Spirit, Moonbeam

3rd level (3 slots): [Animate Dead], [Gaseous Form], Dispel Magic, Meld Into Stone

4th level (3 slots): [Blight], [Confusion], Freedom of Movement

5th level (1 slot): [Cloudkill], [Contagion],  Conjure Elemental, Insect Plague

Symbiotic Entity. Wrathblight channels magic into the cloud of spores that surrounds them. They gain 36 temporary hitpoints and for the next ten minutes their melee weapon attacks and Halo of Spores deal an additional damage die of poison damage.

Wild Shape. Wrathblight transforms into a beast of CR 1 or less for up to four hours, replacing their Strength, Dexterity and Constitution with those of the creature as well as adding the skill and saving throw proficiencies of the creature to their own. If they have the same proficiencies, they keep whichever one is higher. They assume the hit points of the beast and Hit Dice. When they revert to their normal form, they have the same number of hit points as they did when they transformed unless they took more damage than the beast's hitpoints. They cannot cast spells but can maintain concentration while transformed.

Mage Horror. Wrathblight spends Mana Horror points to regain spell slots. The combined level of the spell slots must be equal to half the total Mana Horror points spent.

Multiattack. Wrathblight makes one attack with each of their weapons.

Javelin. Melee Weapon Attack: +6 to hit, reach 5 ft., 1 target. Hit: 7 (1d6 + 3) piercing damage. 

Handaxe. Melee Weapon Attack: +6 to hit, reach 5 ft., 1 target. Hit: 4 (1d6) slashing damage.

Rage. When they take or deal damage, Wrathblight can enter a Rage. While raging, they have advantage on Strength saves and ability checks, their melee weapon attacks deal an additional 2 damage and they have resistance to bludgeoning, piercing and slashing damage. While Wrathblight is raging, all creatures within 10 feet of them take 2 points of poison damage at the start of Wrathblight's turn.

Halo of Spores. When a creature they can see moves into a space within 10 feet of Wrathblight or starts its turn there, Wrathbligh can deal 1d6 necrotic damage to the creature unless it succeeds on a DC17 Constitution saving throw.

Fungal Infestation. If a small or medium beast or humanoid dies within 10 feet of Wrathblight, they can animate it as a zombie. It stands up immediately with 1 hitpoint and acts according to Wrathblight's commands. It can only take the Attack action. Wrathblight can use this feature up to 5 times and regains expended uses when they finish a long rest.