Durability as CON 
Action Check 12+/11/5/2
Movement walk 8, run 24, sprint 36, burrow 4 
# of actions 3
Reaction Score O/2

Mutations Hyper senses, Dermal plating, Redundant vital organs
Defects Light sensitivity, Severe Phobia (deep water)

Attacks
Bite 14/7/4 d6+2w/d8+2w/d4m (LI/O)
Acid see below

Defenses
armor d6+2 (LI), d6+1 (HI), d6+1 (En)
+3 vs melee
+1 vs ranged

Skills
Stealth-hide 12; Stamina-endurance 6, resist pain 4; Awareness-perception 12; Resolve

Description
This mutant mantis has lost its wings. It is brown or yellow with 2 huge eyes (with the typical mantis eye spot) and is between 3 and 6 meters long. The spiracles (breathing holes) along their thorax and abdomen are large and so the ankheg can easily drown. It has gained some flexibility so some think of it as a legged worm.

Encounter
Ankhegs usually are found 3-5 meters underground feeding on the soil, subterranean animals, and animal carcasses. If a large animal (15 Kg+) passes within 20 meters, the ankheg takes d4+2 phases burrowing to the surface and then attacks. If reduced to less than half its wound points or loses any mortal points, it will emit a stream of acid 10 meters long. Anything struck by the acid must make a CON feat check. A Critical Failure means 5d4w, Failure- 4d4w, Ordinary- 3d4w, Good- 2d4, and Amazing- no damage.

Habitat
Ankheg are found in humus rich soils - old forests and farm lands. They will not be found in areas with a high water table or within 100 meters of streams and lakes. During heavy rain they usually come to the surface as not to drown.

Society
Ankheg have small territories and will avoid each other unless a huge animal is killed, then they strip the carcass together. Cannibalism occurs only between adults and small young. Each year they reproduce and have 300-500 young per egg mass. Only 1-2% survive.

Biome - Temperate Forest and Plains
Encounter - Chance Unlikely
Group Size - d4
Organization - Solitary
Niche - Top level carnivore
IQ - Low Order animal

Converted from the AD&D Monster Manual (1st edition).