Each one of these is a Walker brain, maybe some nanites and maybe ammo, all you have to do is fight sentinels until it tells you that a Walker is inbound and dig a hole to hide in, then it'll start raining Walker brains, no need to thank me

Each one of these is a Walker brain, maybe some nanites and maybe ammo, all you have to do is fight sentinels until it tells you that a Walker is inbound and dig a hole to hide in, then it'll start raining Walker brains, no need to thank me