Given the pre-exstitent nature of this creature by other names and in other game systems I do not doubt it has already been done. However, a glance at Core, Whitebox and Complete did not show me one so I decided to give the creature my spin.
Pseudomorphs are carnivorous, semi-sentient creatures that live in caves, dungeons, crypts and other subterranean places. They possess the ability to make themselves appear as any inanimate object and lay in wait for prey to come to them.
In their natural state the pseudomorph appears as a large, pale amoeba-like creature.
Lesser Pseudomorph
Hit Dice: 3
Armor Class: 4 [15]
Attacks: Slam (1d6+2) and Bite (1d4)
Move: 3 [15’]
Save: 16
Special: Stick, Copy
Challenge Level/XP: 4/120
Copy – The Pseudomorph can copy the appearance and coloring of any inanimate object that is at least the size of a large chest.
Stick – Any Melee attack has a 45% chance of causing the attacker to become stuck to the Pseudomorph.
Pseudomorph
Hit Dice: 6
Armor Class: 2 [17]
Attacks: Slam (2d6+2) and bite (2d4)
Move: 6 [30’]
Save: 11
Special: Copy, Stick
Challenge Level/XP: 8/800
Copy – The Pseudomorph can copy the appearance and coloring of any inanimate object that is at least the size of a large chest.
Stick – Any Melee attack has a 65% chance of causing the attacker to become stuck to the Pseudomorph. Further any slam attack by the Pseudomorph has a 75% chance of causing the target to become stuck to the Pseudomorph. While stuck to the Pseudoporph the target takes 1d4 acid damage as the Pseudomorph begins to digest the target.
