Blade Weaving Mastery

I'm not sure if this has been mentioned before elsewhere, so here goes. If you have the Blade Weaving mastery, then if you aim a skill shot into a unrevealed area (Fog of War or Bush for example) and it hits an enemy, then you will gain a stack of Blade Weaving's buff. This is quite useful when you didn't or can't hear the sound of a skill shot connecting with an enemy (do all skill shots play a sound when hit?).

Anyways, just something interesting I found out today.