The quasi-magic firearms I'm going to introduce into our collaborative campaign setting will be very simple: encounter use ranged powers (DEX+2/3 vs REF) with variable damage and rider effects, usually in the form of 1 round of a status + ongoing damage.
Some rarer ones might shoot bullets into your soul (vs. WILL), or have status effects like Blindness as their ongoing effect.
Some rarer ones might shoot bullets into your soul (vs. WILL), or have status effects like Blindness as their ongoing effect.