Ankheg (/ˈæŋkɛg/ ÆNK-eg)

The ankheg was a huge insectoid monster with many slender limbs and large antennae. It burrowed underground and hunted from below.

Description

Ankhegs were covered in a strong chitin armor.

Abilities

Ankhegs could see in pitch darkness, as well as detect vibrations in the earth, from up to 60 feet (18 meters) away. The "attack" acid was part of the digestive system for the creature, so it couldn't digest food for six hours after a discharge.

Combat

The ankheg was an ambush predator that waited around 5–10 feet underground for prey to wander into position. The attack was quick, as the prey was crushed and ground in its mandibles and assaulted with acidic digestive enzymes. If a foe proved too difficult, the ankheg could also squirt acid to take it down. If several ankhegs were attacking a group, the ankhegs would try to attack different targets. If prey was attacked by more then one ankheg, the ankhegs would just play tug-of-war with the unfortunate prey.

Ecology

A typical area could have a lone ankheg, a pair, or a cluster of ankhegs.
Ankhegs that lived in colder areas hibernated during winter. During this time, an ankheg took nutrients through its shell and its antenna.

Diet

Gaining nutrients from the ground, the ankheg also had to hunt fresh meat to sustain itself. It could also eat decaying meat.

Life cycle

Ankhegs mated in autumn, when the fertilized female would kill the male to lay 6–12 eggs inside him. Usually, a high number of eggs survived and hatched within two to ten days and started to feed.
An ankheg broodling did not hunt and remained hidden, while its mother brought it sustenance. After a year, the young were able to fend for themselves. 

Around the second year, the young ankheg shed its chitin before winter. It took a little less than ten days to complete the process and grow a new shell. During this time, the youngling was slower and more vulnerable. To defend itself, it secreted a fluid that smelled like rotten fruit. This defense could backfire, as some would seek out the smell.

Habitats

Living in warm climates, the ankheg dwelt in partially collapsed burrows usually around 40 feet underground. The ankheg hunted in forests or grasslands where prey would wander into its traps. If an area became too barren, the ankheg moved on to other, more lucrative areas. Ankheg tunnels were sometimes filled with the remains of victims, eggs, or chitin. Their tunnels would sometimes be around 60 to 150 feet (18 to 46 meters) long and 5 feet (1.5 meters) feet high. Hollow tunnel ends were used for lair purposes, such as sleeping or hibernation.

Relationships

They were known to compete with giant ants for territory. If they were killed or driven away from their nest, the broodlings left behind would be made to serve the giant ant colony.

Usages

Ankhegs could prove to be useful for a farmer. Provided it stayed alive, its tunnels could bring in water and its excrement contained enriching minerals. Ankheg burrows also aerated the nearby land which could improve crop yields by as much as 15%, providing the ankheg population was managed.
An ankheg shell harvested from a slain ankheg weighed roughly 100 pounds (45 kilograms) Armorers like Jeremy Johnston of Carcino could forge armor from the shells. It took thirteen days to make. The armor was very nearly as effective as full plate mail, but weighed considerably less and could be worn by warriors who usually couldn't wear such heavy armor.

Size
Large
Alignment
Unaligned
Challenge Rating
2
Movement
Burrowing
Vision
Darkvision
Favored climate
Warm
Favored terrain
Underground, plains, forests, grasslands, cleared lands
Average length
10 ft (3 m)
Average weight
800 lb (360 kg)
Skin color(s)
Brown, yellow Green
Eye color(s)
Black

Genetic Descendants

• Ankheg Blood Queen

Scientific Name

Monstrosity

Geographic Distribution

• Asyur

Harvesting

Because this creature is an Monstrosity, the player should roll a Nature Check using the DCs in the table below. On a success, the player is able to harvest the item. On a failure, the item cannot be harvested (either because the character is not skilled enough, or because the item is ruined). The DM should note that many of the items have an expiration, and can not be sold or used after the expiration has passed.
Type: Monstrosity
Skill: Nature

DC	Item	Description	Value	Weight	Exp.	Crafting/Use
5	Ankheg Chitin	Hard and thick sheets of chitin, often used to make armor.	1 gp	30lb	Never	Chitin Plate*
10	Ankheg Stomach	The thick walls of an Ankheg's stomach can be used by magic users to create hardy bags, sacks and pouches.	2 gp	9lb	2 days	Canteen of Last Resort (HHH)*
15	Ankheg Bile (2 vials)	Alchemists use ankheg bile to create various acidic concoctions.	4 gp	1lb	7 days	Use: As an action, you can splash the contents of the vial onto a creature within 5 feet of you or throw it up to 20 feet, shattering it on impact. In either case, make a ranged attack against a target creature, treating the vial as an Improvised Weapon. On a successful hit, the target takes 1d6 acid damage.

Harvesting Meat

The meat of insectiods and arachnids can be nourishing, but are often gamey and tasteless. Some communities frown on eating insect meat (and will only pay half price), while others rely on it. Dungeon Master's discretion.

This creature produces 6d6 pieces of meat, weighing a total of 4 lbs a piece.