Zappfly is one of the types of live ammo used by Stranger. The zappfly never runs out, so no matter what happens, Stranger always has some form of weaponry. They can be charged or shot normally. It is the only Live Ammo in the game that cannot be upgraded, aside from the sniper wasp.
When not lit, they are used as fast-firing bullets good for 8 quick, low-damaging shots. When lit up they release an electrical charge, useful for activating machines or to knock out enemies by depleting their stamina. One charged shot: Knocks out (or takes away a bit of stamina, depending on the enemy) Three charged shots: Kills enemies (unless enemy is too big/powerful, such as the bosses)
- Stranger's Wrath (First Appearance)