"Not sure what breed o' gobbo this blighter used to be. Ain't been their kind that's infested the swamps fer ages. Yet, here it is.

Figure that the little thing o' purple rags o' flesh and pitted bones got infested by some sort of leech-mite things. Seems it was just as poisonous ta the vermin as they were to it. Now dozens of the fat, vile squirmers writhe in its porous form.

Careful they don't get on you or the damn things will eat ya alive. Hell, they even devour the risen. Cunning bastard always lays traps too. Be careful."

-Fossor Carvilius Graeme

The Bog Beast

Small undead, chaotic neutral

Armor Class 13

Hit Points 78 (12d6 + 36)

Speed 0ft

Flight 40ft (hover)

Str 7 Dex 16 Con 16 Int 9 Wis 14 Cha 16

Skills: Perception +5, Survival +5

Condition Immunities charmed, exhaustion, frightened, grappled, paralyzed, petrified, poisoned, prone, restrained

Damage Immunities cold, necrotic, poison

Damage Resistances acid, fire, lightning, thunder; bludgeoning, piercing, and slashing from nonmagical attacks

Senses darkvision 60 ft., passive Perception 15

Languages Common, Goblin

Challenge 6 (2,300 XP)

Ethereal Sight:

The ghost can see 60 ft. into the Ethereal Plane when it is on the Material Plane, and vice versa.

Grub Hub.

The ghost automatically charms any swarm of tiny beasts of CR 2 or less within 30ft. The swarm becomes friendly to the ghost and follows its mental commands as long as it remains within 90ft.

Incorporeal Movement:

The ghost can move through other creatures and objects as if they were difficult terrain. It takes 5 (1d10) force damage if it ends its turn inside an object.

Actions

Squirming Swipe.

Melee Spell Attack: +6 to hit, reach 5 ft., one target. Hit: 10 (2d6+3) necrotic damage. In addition, a creature must succeed on a DC 14 Dexterity save or be infested with Spectral Squirmers.

An infested creature must succeed on a DC 14 Constitution save every hour or lose one unspent Hit Dice. If a creature cannot lose a Hit Dice, it dies and its corpse is rapidly reduced to ectoplasm. A Greater Restoration or Heal spell ends the infestation, as does entering hallowed ground or if the creature takes at least 13 Radiant damage.

Etherealness:

The ghost enters the Ethereal Plane from the Material Plane, or vice versa. It is visible on the Material Plane while it is in the Border Ethereal, and vice versa, yet it can't affect or be affected by anything on the other plane.

Create Effigy.

The ghost transforms a pile of swamp debris within 5ft into an ordinary object of its choice of the same size. This transformation lasts until the next sunrise or until a creature other than a warm of tiny beasts touches it. The ghost can have up 3 such effigies at a time.