Spellcasting. Kevin is a 20th-level spellcaster. His spellcasting ability is Wisdom (spell save DC 19, +11 to hit with spell attacks). He has the following druid spells prepared:

Goodberry Adept. At the start of Kevins turn the bush on his back produces 12 berries.

Hungry Jaws (1/per day). In battle, Kevin can throw himself into a vicious feeding frenzy. As a bonus action, he can make a special attack with his bite attack. If the attack hits, it deals its normal damage, and Kevin gain temporary hit points (minimum of 1) equal to his Constitution modifier.

Hold Breath. Kevin can hold his breath for up to 15 minutes at a time.

Actions

Multiattack. Kevin Goodberry can make 2 attacks: one bite attack and one attack with his quarterstaff or his Javelin of Darkness.

Bite. Melee Weapon Attack: +7 to hit, reach 5ft., one target. Hit: 4 (1d6+2) piercing damage.

Change Shape. Kevin magically polymorphs into a beast or elemental with a challenge rating of 5 or less, and can remain in this form for up to 9 hours. Kevin can choose whether his equipment falls to the ground, melds with his new form, or is worn by the new form. Kevin reverts to his true form if he dies or falls unconscious. Kevin can revert to his true form using a bonus action on his turn.

While in a new form, Kevin retains his game statistics and ability to speak, but his AC, movement modes, Strength, and Dexterity are replaced by those of the new form, and he gains any special senses, proficiencies, traits, actions, and reactions (except class features, legendary actions, and lair actions) that the new form has but that he lacks. He can cast his spells with verbal or somatic components in his new form.

The new form's attacks count as magical for the purpose of overcoming resistances and immunity to nonmagical attacks.

Corrosive Berry. Kevin grabs one berry, and throws it at a target within 30 feet of him. Make a ranged weapon attack against the target. On a hit the target takes 1d6 acid damage.

Kevin can expend more berries to increase the damage by 1d6 for each berry expended to a maximum of an additional 3d6 acid damage.

Javelin of Darkness. Ranged Weapon Attack: +7 to hit, range 30/60, one target. Hit: 7 (1d6+4) piercing damage. Wherever the javelin lands, a radius of darkness out to 30 feet radiates from this point for 1 minute. The darkness dissipated whenever the javelin is removed.

Land of the Goodberry (7/per day). Kevin changes a 10 foot radius of ground within 60 feet of him that he can see into the Goodberry terrain as a bonus action.

The Goodberry terrain acts as magical rough terrain, and any enemies who start their turn in the terrain or move into the terrain on their turn must make a Dexterity saving throw, on a failed saving throw taking 3d6 magical bludgeoning damage from the goodberry vines and half as much on a successful save.

Quarterstaff. Melee Weapon Attack: +7 to hit, reach 5ft., one target. Hit: 4 (1d6+2) bludgeoning damage.