After clearing nightmare as a paradox mage a few month ago i took a break from tome. As i decided to give it a go again i first took a look at the character vault and noticed that no paradox mage had ever cleared insane difficulty. So i thought i should give it a go:
http://te4.org/characters/107553/tome/2 ... c375a3f84d
To my dismay i finished it with only 2 lifes left, dying a total 5 times. Most of those deaths can be attributet to my own carelesness, tactical misjudgement and even blatant stupidity in one case (i entered the dark crypt even though i knew i wasn't ready for it

I have to admit though that i certainly made use of the item vault and sent some pretty gear over from my older characters. Not really insanely powerful random artifacts, but some unique artifact which i thought to be necessary for my strategy to hold ground: Telos Top Half, Life Drinker, Untouchable, Threads of Fate and Ring of the Dead are the most noticable ones i think.
While doing this playthrough i learned a whole lot more about the paradox mage than i had ever imagined could still be learned. In my opinion the best way to play a paradox mage is not as a pure nuke caster like archmage but rather playing from a much much more strategical and creative point of view. The class offers a lot of seemingly gimmicky abilities but if you see their hidden synergies and think up creative ways to use those for your purpose it's possible to come up with some tricks that are so good they can almost be called broken.
I think i can share at least one of those: If you use cease to exist on an enemy you can afterwards drink the potion of invincibility giving you a 1 million shield. then all you have to do is killing said enemy before cease to exist runs out, which will turn back time to the point before you drank the potion. Hurray for infinite invincibility potions. This makes you unkillable against enemies you are sure you can kill within 10 turns. The -50% resist reduction of cease to exist helps a hell lot with killing them fast. But to be safe you can beforehand always safely check with precognition whether you are able to kill them in time.
For my playthrough i used a couple more tactics which i won't share just yet though. Before i do that i plan to defeat madness with a paradox mage, afterwards i can write a guide or something in case people would like to read it.