Common Mirelurk

The common mirelurk (Limulus polyphemus horrendus) is a mutated form of the Atlantic horseshoe crab, capable of thriving in both freshwater and saltwater environments. The common mirelurks has a thick, domed carapace and a pair of powerful pincers, and move in an upright gait, supported by four armored pedipalps.

Common mirelurks live in groups of up to two dozen individuals, and often share territory with other species of mirelurk, particularly mirelurk hunters. Rarely, a female common mirelurk will grow to immense size to become a mirelurk queen.

Aquatic
Mirelurks are aquatic creatures and can breathe in air or water with equal ease. However, mirelurks are too heavy to swim effectively, opting to scuttle along the bottom instead.

Armor +6
The common mirelurk has a thick, resilient carapace. However, its face is vulnerable to attack. Called shots that hit a common mirelurk's face (called shot at -4) negate its Armor entirely.

Burrowing
Common mirelurks are ambush predators, burrowing beneath sand or mud and waiting for unsuspecting prey to pass overhead before bursting from the ground and attacking. When burrowed, a common mirelurk gains Heavy Cover (+4 to Stealth rolls, -4 to attacks against it, and preventing attacks against its unprotected face). A burrowed mirelurk has no trouble sensing the world above it, but must spend a turn digging itself out before it can attack.

Radiation Immunity
Like most mutant creatures, common mirelurks are immune to the effects of radiation poisoning