Nresiil and various other explorers and agents operating in civilized space often bring some highly concealable weapons and equipment for their protection, where discretion could be highly useful, or whenever they don't want to bother themselves with all kinds of gear.

This classic weapon, made out of interestellar spaceship-grade materials, is packaged with high-tech methods to fit even into small pockets, and can deploy into a weapon ready with some ammo with one strong movement of the arms and hands.
This crossbow is adjusted for the strangth of Nresiil and can shoot bolts of less than two grams at more than 600 km/h, featuring in-flight expanding monomolecular-sharp broadheads for short-range self-defense.

Various other kinds of these cards and small items exist, for example he has a spare card that mechanically transforms into purely bolts for this crossbow.