Steel Packed Powder, the 25 point minor trait in the Explosives line reads "Explosions cause vulnerability for 5 seconds". You can stack vuln very quickly by spamming grenades into an area.
You actually don't lose out on much by not taking the 25-30 traits in firearms. I run a similar build with the 10% rifle damage and 20% rifle skill recharge rate for the amazing utility you gain from the rifle (net/overload).
Jump Shot hitting both times with 20 stacks of vulnerability is no laughing matter either.
Froze
Member Since 23 Aug 2012Offline Last Active Dec 14 2012 04:20 PM

Find content
Not Telling