Yeah...technically Set traps isn't even a skill in PnP...it's a non-combat proficiency that anyone could technically learn (it is in the rogue pool though, so it costs double per rank for non-rogues unless there's an exclusion (such as all rangers can learn it for normal cost, and stalkers are supposed to have 1 rank free at creation)).
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Set Trap determines your ability to put down your own non-epic traps. Epic level traps bypass any Set Trap skill you may have.