Serrated Blades is the second Kunai technique. It doubles the damage of every Kunai, turning a stagger tool into a real threat.
Use Kunai to finish weak enemies outright, not just to stagger them. Archers and sappers are good targets.
You need Hidden Blade first.
Blinding Dust
Smoke Bombs briefly blind enemies in the cloud, and the smoke lingers longer.
Concussive Blast
The Black Powder Bomb's shockwave knocks enemies down.
Explosive Powder
A direct Sticky Bomb hit kills the target, and the blast grows bigger and hits harder.
Explosive Shrapnel
Shrapnel raises the Black Powder Bomb's damage and blast radius.