monster

Fathomer

CR 2

Medium Humanoid (human), Neutral Evil

Reveal Stat Block

Armor Class

Hit Points

52 (8d8 + 16)

Speed

30 ft.

str

dex

con

int

wis

cha

Traits

Shapechanger (2/Day).The fathomer can use its action to polymorph into a Medium serpent composed of water, or back into its true form. Anything the fathomer is wearing or carrying is subsumed into the serpent form during the change, inaccessible until the fathomer returns to its true form. The fathomer reverts to its true form after 4 hours, unless it can expend another use of this trait. If the fathomer is knocked unconscious or dies, it also reverts to its true form. While in serpent form, the fathomer gains a swimming speed of 40 feet, the ability to breathe underwater, immunity to poison damage, as well as resistance to fire damage and bludgeoning, piercing, and slashing damage from nonmagical attacks. It also has immunity to the following conditions: exhaustion, grappled, paralyzed, poisoned, restrained, prone, unconscious. The serpent form can enter a hostile creature's space and stop there. In addition, if water can pass through a space, the serpent can do so without squeezing.

Olhydra's Armor (Human Form Only).The fathomer can cast mage armor at will, without expending material components.

Actions

Constrict (Serpent Form Only).mw 4 to hit, reach 5 ft., one target. ({@damage 2d6 + 2) bludgeoning damage. If the target is Medium or smaller, it is grappled (escape 12). Until the grapple ends, the target is restrained, and the fathomer can't constrict another target.

Dagger (Human Form Only).mw,rw 4 to hit, reach 5 ft. or range 20/60 ft., one target. ({@damage 1d4 + 2) piercing damage.

Fathomer

Fathomers are cultists who have sealed a pact with Olhydra, Princess of Evil Water. In addition to their spellcasting abilities, fathomers have the ability to transform their bodies into water, taking serpent-like shapes. In their water serpent forms, fathomers gain many of the resistances elemental creatures possess, as well as the ability to grapple and crush their enemies with their watery bodies.

Fathomers often serve as spies, infiltrators, and assassins for the water cult, since they can slip under locked doors or pass through bars and similar obstacles with ease.