Apparently Gren never walked through a metal detector.

i mean not to put too fine a point on it, but holy fuck a fusion core makes a hunter's weapon look like a toy

that's up there on 'irradiate everyone around him if there's a training accident' tier of 'goddamn this is a terrible idea'

overlooking that he's a cyborg requires willing suspension of disbelief, but it's at least somewhat plausible. hiding a past, weapon systems, and a goddamn  f u s i o n  c o r e  just bane'd that suspension