Talk:Upgrades/@comment-16533050-20150807190905/@comment-26396097-20150807191734

Yes. A lot of the base upgrades are only listed on the pages of the items they affect, are only alluded to on some others (Mask Optics 1), or aren't listed at all (Bone Charm Upgrades, Boot Stealth 2, Grenade Capacity, Sword Crossing).