Gui Jian (鬼箭)

Ming Dynasty caltrop container
Gui Jian, from 'Ji Xiao Xin Shu (《紀效新書》)'.
Gui Jian (鬼箭, lit. 'Ghost arrow') is a type of iron caltrop that is cooked with human feces so that it can cause infection when stepped on. It is very dirty and poses danger to its user, and is usually kept inside a container made of bamboo. Instead of planting caltrops one by one, the user can simply scatter the caltrops directly from container.

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