Weapon Set Bonuses work in BG's after you die once and you can stack different ones on top of eachother, including Chance on Hits.
Ofcourse most weapon sets are removed but the Crystal Fang/Venomspitter set is still obtainable and works wonders in BGs. Here's how it works;
1. Enter BG.
2. Equip Weapon Set Bonus (my favorites are Fang of the Crystal Spider and Venomspitter, spammable immobilize).
3. Die once.
4. Equip normal weapons and benefit from whatever set bonus the previously equipped weapons had.
5. Collect more weapon set bonuses and repeat steps 1-4.
6. Have 4 Weapon Set bonuses as passive abilities and rek everyone.
Here I have my Bonereaver's Edge equipped, while being a tiger from Thekal and Arlokk's Grasp and webbing the target with my Crystalfang/Venomspitter;
What other people don't seem to realize is that you have to die in a BG once with the weapons equipped before the proc starts functioning (inside of BGs and if you want to stack them).
Been doing this for a day or three now, it's a lot of fun. Rend's swords, Primal God Blessing (Arlokk's/Thekal's Grasp), Eskhandar Claws and Venomspitter/Crystalfang all work and are all stackable.
I wanted to keep it a secret for a while longer but they were getting to close on the US forums already
.