I have been intrigued by how certain traits, feats and equipment qualities combine/interact. Basically these,
Ninja TrickBleeding Attack
This feat: Disposable Weapon
This Feat: Splintering Weapon"
This equipment special quality:Special materials
All interact.
Basically..a Ninja who attacks with either Wushu-darts
or bronze daggers (Fragile/antique weapon quality) to inflict not just damage and sneak attack damage but also adding massive bleeding damage to said wounds to finish enemies faster.
There is also the 'Blade master' archetypes for Ninja/Rogue to increase the amount of sneak attack damage from knives from D6 up to D8, though at the expense of limiting damage from other blade weapons and losing trap finding.