Need help defeating Act 3 boss

[Maktaka]

I just got to the Act 3 boss in Epic, and he's owning me. Badly. I don't even get his health down 25%. I'm wondering what other rogues of any flavor have done to handle him (I'm going Warlock).

My build (http://www.titancalc.com/TitanCalc.asp?mastery=Warlock&master1=2&master2=6&m1=16-6-0-0-8-0-0-0-1-0-0-0-4-0-0-0-0-0-0-0-0-0&m2=32-0-6-1-10-1-8-8-0-5-0-0-0-0-0-8-8-0-0-6-0) for any advice you can give. I just unloaded all my points from Spirit Ward and Spirit Bane (no use against a Titan), so I've got 17 spare skill points after all that, but I have no idea where to put them. I'd rather avoid summoning of any kind since that's not really my play style, but I don't see anything else I can do to up my damage. I don't really get 1 shotted, but the damage comes so close that if I'm ever NOT at full health when a mega-hit comes, I will die.

Thanks for any suggestions.

[kuchel]

There's a bunch of other useful threads on the Rogue mastery. I won't go into the content of those because there's a LOT of good discussion from all sides there, and you'll probably benefit a lot by familiarising yourself with all of those.

What I will say though, is that I know summons aren't your style. But without any summons you will have a LOT of difficulty, especially against bosses.

Most masteries have some useful skills that keep you alive, and if you don't use those skills your making life hard for yourself. In the Spirit Mastery it's those summons that will help you a lot. Sorry to say this, but even if it's against your style you're going to have to pick up a point in Outsider and a good deal in your Liche if you want to be able to handle bosses.

[Lillis]

You can temporarily respec to full traps. Then you can stand on the catwalk that leads down to that boss and throw down your traps.