Medium aberration, neutral
No. Appearing: 1d4
HD 4, 30 hp
AC 16, resistant to bludgeoning damage
MV 30 ft., swim 30 ft; a hirudinoid can squeeze through spaces as small as 1 foot wide
Attack: Sucker-lined fist +4 (1d4 damage) x 2
As a free action, the hirudinoid can attempt to grapple a creature it has successfully hit with a melee attack, gaining a +4 bonus to the check. If both fists strike the same target, the hirudinoid has Advantage on the grapple. At the start of its turn, a hirudinoid drains 1d6 points of Constitution from a creature it has grappled.
Despite its bipedal stance and humanoid body-plan, the walking leech is an invertebrate that maintains its upright posture through hydrostatic pressure. Hirudinoids only have a rudimentary intelligence and lack the ability to vocalize sounds. Their vision and hearing are quite limited, just good enough to detect movement. They hunt mainly by scent and body heat.
They lurk in sewers, trash middens, and other dark, unhygienic environments. Wounds inflicted by a hirudinoid need to be cleaned thoroughly to minimize the risk of infection.