Reaper

Overview
Reaper -- aka Wraith -- aka Ghost

"These ethereal, unnatural beings aren't born as most creatures are, Instead, they are formed by the coalescence of a number of deceased creatures' souls. holding no emotions of compassion, a wraith will pursue and cut down any creature that crosses its path. there are rumors that silver weapons can be used to cause them significant damage."

- from the in-game Bestiary

General purpose
To protect your base