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Blood Ooze

Swelling like a bubble about to burst, this oozing thing looks like it is made entirely from blood. Its slick, crimson skin is marred only by spots that look like clots formed on the surface.

Created through the foulest of alchemical rituals, the blood ooze seeks only one thing: to increase its mass by consuming blood from the living. The blood ooze hides within the body of its victims, only bursting out to attack when another meal draws near, leaving the body a husk of its former self.

The process by which such an ooze is created involves draining the blood of at least four Medium creatures and feeding all of the collected blood to a fifth creature, along with deadly reagents designed to prevent the blood from coagulating. During this time, the host slowly dies while the blood ooze takes form, emerging 2 to 6 hours later. Blood oozes have no loyalty toward those who created them, but some creators have noted that newly formed blood oozes seem to avoid harming other members of the host creature’s family.

It is not widely known that an existing blood ooze can reproduce by splitting itself in half. It undergoes this division only if it has grown so large that splitting in half would create a pair of normal-sized blood oozes, such as the one listed below.

Recall Knowledge - Ooze (Occultism): DC 19
Unspecific Lore: DC 17
Specific Lore: DC 14

Elite | Normal | Weak
Proficiency without Level

Blood OozeCreature 4

N Large Mindless Ooze 
Source The Fall of Plaguestone pg. 63
Perception +8; motion sense 60 feet, no vision
Skills Athletics +13, Stealth +4 (+12 if hiding inside a dead body)
Str +5, Dex -4, Con +5, Int -5, Wis +0, Cha -5
Infuse Corpse A blood ooze can seep into a corpse's wounds, displacing its natural blood. It can burst out of the corpse as a free action.
AC 12; Fort +15, Ref +6, Will +6
HP 90; Immunities critical hits, mental, precision, unconscious, visual
Clot Trigger The blood ooze is damaged by a piercing or slashing attack. Effect The blood ooze forms a clot around the wound, reducing the damage taken by 5 (to a minimum of 0).Blood Pool Whenever a creature adjacent to a blood ooze takes bleed damage, the blood ooze regains an amount of Hit Points equal to the damage dealt.
Speed 10 feet, climb 10 feet
Melee pseudopod +15 [+10/+5] (reach 10 feet), Damage 1d12+8 bludgeoning plus 1d6 persistent bleedSiphon Vitality The blood ooze draws forth blood from nearby creatures, causing their flesh to break open and blood to spill out which replenishes the blood ooze. Each living creature within 15 feet takes 3d6 slashing damage (DC 21 basic Fortitude save). The blood ooze regains an amount of Hit Points equal to half the damage Siphon Vitality dealt to the single creature that took the most damage.

Sidebar - Related Creatures Variants

Blood oozes are sometimes made from creatures with very different types of blood that can occasional impart other powers and abilities to the resulting blood ooze. Blood oozes made from dragon blood often gain some small amount of energy resistance based on the dragon's type (fire resistance 5 for an ooze crafted from a red dragon, for example). Those made from trolls gain a limited form of regeneration. Finally, a blood ooze made from the blood of fiends might gain a cruel and vindictive intelligence drawn from the thoughts and minds of its parent creatures. Such an ooze might even work with others, tricking lesser creatures into thinking it is some sort of deity or engaging in whatever ruse it can contrive to secure a constant source of fresh blood.

All Monsters in "Ooze"

Amoeba Swarm1
Black Pudding7
Blood Ooze4
Carnivorous Blob13
Chromatic Ooze18
Crawling Slurry16
Gelatinous Cube3
Giant Amoeba1
Gray Ooze4
Ooze, Gunpowder14
Id Ooze7
Ochre Jelly5
Ooze, Pyronite10
Rust Ooze3
Sewer Ooze1
Slime Mold2
Tallow Ooze11
Vaultbreaker Ooze6
Verdurous Ooze6
Yeast Ooze2


Source Bestiary pg. 254
Slimes, molds, and other oozes can be found in dank dungeons and shadowed forests. While not necessarily evil, some grow to enormous sizes and have insatiable appetites.

Sidebar - Related Creatures Amoebas Large and Small

Giant amoebas and amoeba swarms are usually found near each other, as the two oozes are part of the same life cycle. When a giant amoeba grows large enough, it can spontaneously split apart into two separate amoeba swarms, and when an amoeba swarm feeds enough, its individual components can fuse together into a single creature.

Sidebar - Additional Lore Oozing Acid

Many oozes have acidic attacks that can quickly degrade flesh, wood, and even stronger materials. Some believe that oozes are the result of alchemical or magical experimentation run amok, while others postulate that they simply emerged from the natural processes of evolution.

Sidebar - Related Creatures Other Oozes

Many varieties of these nearly mindless predators exist in the world. Some are mere variants, with different colored puddings, jellies, and oozes with little to differentiate them from those presented here other than their habitat. Others are more specialized, or even dangerously intelligent. The shoggoth is one such example, but another variety of deadly and powerful ooze is the thankfully rare blight, a creature composed of protoplasm and eyes that curses entire regions with its presence.