Ambush Trap Blueprints
From MHWiki
These blueprints are vital in knowing how to construct the Ambush tactical trap. These prints show how to set up the eight required droids as well as how to construct a wall separator from splintered wood, rice paper and a Furoma Master's Seal. Be warned, Grandmasters have been known to ruin the trap parts during assembly!
Dropped by: Assassin Mouse, and Hapless Mouse
Many hunters argue that the best way to acquire these blueprints is to catch Hapless mice in the Pinnacle Chamber.