Mesmer of DOOM

How does my Assassin get Verata's Aura?

I love GW and all, but...

Keys for chests-worth buying?

IW builds-PVP only?

Im pretty new to GW, have a Me/?? (mo atm), ascended, yadda yadda. Ive looked around, and it appears that IW builds are mostly pvp oriented. Are...