Item: Caltrop
Base Info
Self-priming when set, total damage is 15 + (YourEngineeringLevel)/5
Weight: 3 emu
Stackable: yes
Storage: hazardous
Server Description: Does 15+ engineering/5 damage, self priming
Item ID / Image ID: 712 / 466
To Make
Skill: Engineering
Recommended Skill Level: 16
Base Experience: 50
Food Used Per Mix: 25
Required Knowledge: 
Book of Caltrops
Required Nexus: Artificial 1
Ingredients
Total Ingredient Weight: 12 emu