▁ant agon ist , ▁along ▁with ▁Lady ▁H era ▁Vis ari ▁( S col ar ▁Vis ari ' s ▁daughter ) ▁who ▁has ▁inherited ▁her ▁father ' s ▁throne . ▁By ▁the ▁end ▁of ▁Kill zone ▁Sh adow ▁Fall , ▁it ▁is ▁revealed ▁that ▁the ▁main ▁ant agon ist ▁is ▁St ahl , ▁who ▁managed ▁to ▁surv ive ▁the ▁events ▁of ▁Kill zone ▁ 3 , ▁but ▁is ▁dispatch ed ▁by ▁Ve kt an ▁Security ▁Agency ▁director ▁Thomas ▁S inc la ir . ▁ ▁Game play ▁Kill zone , ▁Kill zone ▁ 2 , ▁Kill zone ▁ 3 , ▁Kill zone : ▁Mer cen ary , ▁and ▁Kill zone ▁Sh adow ▁Fall ▁are ▁first - person ▁shoot ers . ▁Kill zone : ▁Liber ation ▁is ▁presented ▁as ▁an ▁is ometric ▁tw in ▁st icks ▁shoot er . ▁The ▁games ▁were ▁developed ▁by ▁Gu err illa ▁Games , ▁except ▁for ▁Kill zone : ▁Mer cen ary , ▁which ▁was ▁developed ▁by ▁Gu err illa ▁Games ' ▁sister ▁studio , ▁Gu err illa ▁Cambridge , ▁and ▁published ▁by ▁Sony . ▁Play ers ▁can ▁carry ▁two ▁different ▁weapons ▁at ▁any ▁given ▁time . ▁Play ers ▁can ▁either ▁obtain ▁am mo ▁or ▁swap ▁out ▁their ▁current ▁weapons ▁with ▁any ▁weapon ▁dropped ▁by ▁a ▁down ed ▁fo e ▁or ▁from ▁those ▁scattered ▁around ▁the ▁various ▁maps . ▁In ▁Kill zone ▁ 3 , ▁players ▁can ▁carry ▁up ▁to ▁three ▁weapons , ▁with ▁the ▁third ▁weapon ▁spot ▁reserved ▁for ▁heavy ▁weapons ▁( e . g . ▁machine ▁gun ,