Osicat's Condi Build?
use pistol 5 for stun interrupt, or if running staff nr 5
Quick fingers.
Get 2 clones and phantasm 5 (torch up). Once he hits with his attack that is 3 stacks, then shatter for another 3 stacks, scepter 3 for 5 stacks, then if you have perplexity you will have probably gotten 3 stacks from the 4 set bonus, then use staff 5 and if you get an interrupt that will be another 5 stacks.
If you can do this fast (and with some luck land everything) you can quickly get the 15-20 stacks you have heard about.
Also + 40% cond dur food will help keep them up longer.
Staff 5 is an ethereal combo field.
Duelist gives projectile finishers. (20% untraited, 100% traited for duelist discipline)
Go crazy.
Basic [BS] NSP/Mag