If you are like me and just going through the challenges after having beat the last boss, and if you have alteration 12 (i think), then the "portal" and "teleport to portal" spell works for this.

So i didn't have any of these when i unlocked the challenge and i tried to go at it ready to make it trough with just guts and perseverance but after i died the first time the challenge won't start over anymore.... did i just end up permanently losing my chance to go at it on my main save?

really? its that easy/cheatable?

You're right:)

phase portal works , so you can do it in 1sec

You are welcome:)

ah, i thought all the things needed to complete the challenge can be found at zoran, anyway thanks, great idea for completing the challenge ^.^

Oh wait, i've mentioned that you can get only scrolls at Zoran's shop. Ghost potion you can later in the game.

unless zoran get's more stuff as i level up/progress trough game

I'll check it out. Maybe recent patches cahnged something.