Dreifacharmbrust

Dreifacharmbrust (DOP-pəl-arm-broost; pl: -brüste; Ger. Dreifach "triple" + Armbrust "crossbow") is a type of crossbow designed by Grimms to kill Wesen. An improvement on the Doppelarmbrust, which can fire two bolts without reloading, the Dreifacharmbrust can shoot three. The bolts can be loaded with many different types of poisons and serums.

Description
The standardized version, as shown in the Grimm diaries, is one loaded with extract, and the other with  extract. Many other herbs or potions can be added to the bolts as a way to administer them. Compared to the standard version and even the Doppelarmbrust, the Dreifacharmbrust is quite large, but it can still be held with just one hand.