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The Desolation brought a lot of the world to ruin, but within that ruin are treasures. Scavengers are the sorts who know best how to pick through those, find the diamonds in the rough, and bring them back home. These can be trinkets and artefacts, but desperate times call for desperate measures and often Scavengers will find themselves picking through the remains of the fallen as well.
You're able to sift through the things left behind in the world and find the rare gems within them.
Three times per adventure when you have time available at the end of an encounter you may tell the GM you are having a look around for something and what the flavour of that is, and they will give you an item with a relevant minor benefit.
Example benefits could include: