Synonyms: Hidden Object
To acquire it, you need to already have another Feat related to it, for example : No prerequisites, anyone can take this Prowess.
Your Game Master may accept to waive such prerequisites if your background or in game actions justify it. Unlike normal Feats, a Prowess can be acquired several times.
Thanks to constant paranoia and careful preparations, you happen to have the exact item you need right now !
It could be anything that you can carry and afford.
A rope, a bow with arrows, a chain mail, a bar to block a door, a bottle of alcohol. Anything at all.
The only limitation is that it should be something easy to get, for example this cannot be an antidote, a smoke bomb or a powerful poison.