I snuck a few rounds in on Friday at work with an online generator built off of James Raggi's Random Esoteric Creature Generator to see what I could come up with between processing files. This one struck me as a delight, and I saw immediate similarities between it and the legendary Manticore, hence the name. Stats reflect how this creature would appear in Lamentations of the Flame Princess.
# Appearing: 1
Armor Class: 18
Hit Dice: 6
Attacks: 1 (Tail)
Special Abilities: Poison - Strong (-1 Save or Die), Bonus Attack on a successful hit, ESP
Body Shape: Serpentine
Basic Characteristics: Insectile
Distinctive Features: Shambling Gait
Conflict Motivation: Territorial
Combat Strategy: Weakest
16' long and 3' tall at the shoulders, covered in jagged, darkly-metallic exoskeleton, with a long, curving neck and an equally-long tail that curls up slightly at the end, which is barbed and drips venom like a scorpion's. The body is supported by six slender, jointed legs, ending in wickedly-hooked claws that give it significant traction when charging prey. The head is relatively large, dominated by six purple eyes, a wide mouth lined with hundreds of tiny, needle-like teeth, and a pair of bony antennae rising in a "V" from between the two clusters of eyes. The teeth are too small and fragile for attacking armored foes, causing the manticore to rely exclusively on its stinger in combat.