I finally finished Ultimate difficulty (well, vanilla content, I've not run Ultimate Malmouth yet), using my Warder. Only took 520 hours of being distracted by alts :p
After that I've revisited my Trickster and I'm remembering how much I like this build. It plays kind of like a pet character, but a bit more active and without the need to keep pets alive (especially now that Blade Spirit is permanent once summoned). Basically I lock down the enemies with Grasping Vines and Blade Trap, while Wind Devil, Blade Spirit, and Nemesis run around killing everything. For tougher enemies I pop a Storm Totem or three. And all the while there's devotion and gear powers proccing constantly from all the DoT damage ticking away. It's fairly rare anything actually manages to get into range to attack me, much less endanger me (and when they do there's Pneumatic Burst and Blade Barrier). Killed Alkamos in the Steps of Torment today and only went below 90% health once in the whole fight.
The only caveat is I'm only up to Elite on her so far; I don't know how it'll hold up on Ultimate (though my experiences say Ultimate isn't quite as big a deal as some people make out, at least outside of the big world bosses).
So here's the build:
Current build, melting through EliteTarget level 100 build