Sluggers are the direct descendants of mutant parents. A hitman, and another RAD-X parent. They have none of the advantages and all of the disadvantages, these poor unlucky souls struggle daily. Their large arm acts as deadweight, and cannot be used for movement. Sluggers also, can have any RAD. They are born with RAD-1, if they survive child birth, and can progress naturally through radiation exposure. They do NOT have to be feral.
There are also other mutant descendants, sluggers are just one example. There are leecher descendants, creeper descendants, crusher descendants, marauder descendants, etc.
Sluggers are generally rare and can only be found in ATF 3, ATF 5, and ATF 6.
(edited by NuncleUncle. If there's any doubts, please dm me on discord NuncleMyUncle#6762.