Source: Warhammer Armies Project: Unofficial 9th Edition

Caltrops
URL Copied!

Caltrops are an antipersonnel weapon made up of two or more sharp nails or spines arranged in such a manner that one of them always points upward from a stable base.

The Caltrops may be used as a Stand and Shoot reaction. All models in the enemy unit charging them has to take a Dangerous Terrain test as soon as it comes within 4" of the Ninja unit.

Next - Fire Bombs (Nippon)