The "skin" of an algoid is coarse and rough with a leafy texture. In its natural surroundings, it is nearly invisible until it attacks. Algoids use this natural camouflage when prey is nearby. The algoid lies in wait, submerged in water or a bog, as it watches its prey. When a potential victim passes nearby, the algoid springs to attack. It is roughly humanoid in shape and resembles a green humanoid. Algoids make their lairs in marshes and swamps. They are often encountered with other marsh-dwelling sentient plants; though never with shambling mounds (they hate them and usually attack them on sight).