On land, the creatures move slowly, with a disjointed, staggering stride. In the water they seem to slither and twist along their chosen path, and being undead they do not need to breathe.
Oowombe are drawn to the living, seeking to envelop and drown their victims in ooze. The remains of those slain in this fashion are then dragged back to the creature's place of origin, where the dark power of the swamp changes them into another Oowombe after two to four days. Each Oowombe has the base physical characteristics as the creature it was created from, including natural defenses and weaponry, with the following modifications:
- Good toughness - the creature's thick coat of ooze provides protection from physical blows.
- Superb resistance to fire, electricity, and cold - elemental effects do little damage to the Oowombe's bloated form.
- Immune to poison - being undead has certain advantages.
- Slow movement - the creature suffers a one rank movement penalty relative to its base form.
- Good swimming speed - Oowombe can slither and twist through water with surprising speed.
- Trail of goo - the creatures leave a sizable trail of slimy goo wherever they go. Anyone stepping on this trail must make a Good test of agility or be slimed (see below).
- Any target struck by an Oowombe must make a Good test of agility or be slimed (see below).
- Once per round an Oowombe can belch forth a globule of goo, which can strike a single target within 20 feet. Any target struck by this globule must make a Great test of agility to avoid being slimed (see below).
- Oowombe constantly exude the slimy goo that coats their form, giving them an effectively endless supply.