Well, as the title suggests I find myself just a tad useless in certain areas of the game.. Shaverath being one of the more serious ones, as I really like that end-game area..
(I could Otto's Irresist most things, but that's a one-target-spell and trying to actually kill those pesky demons afterwards is a different story..)

Still, it's not the only place, as some of the quests in the Orchard (Temple of Vol comes to mind) have some fire (and cold) immune peeps in them.. And I was (and am) specialized in fire and cold.. First time doing a Sorc, bear with me..

Well, I tried going for Discoball, but while it works some of the time (I am a WF, thus a serious hit on the DCs...(And I took Spell pen, Not Focus), most of the time is is pretty much just a wasted spell.. Even the Heightened Web isn't very effective and even if it is, I tend to zerg through my spell-points trying to kill whatever I caught in it..

So, as you can imagine, I'm feeling a bit lost here..

I am gonna TR my WF Sorc as soon as I hit 20 with him and then work my way back up.. But this time I want to end up feeling at least somewhat useful. So I'm trying to work out what I need to look for.. Ie.. Feats, spells and hopefully a few tactics..

What should I expect my role to be in the end-game content?
Which spells are the most useful for me? (Again, I can either do spell pen or Focus, but not both) and how do I twink out myself to maximize their potential?

Basically, what I'm asking for is a 101 on end-game content for a WF Sorc...

(As a bonus, I would like to be able to solo the Temple of Vol.. Shouldn't be impossible, but what am I looking for? Preferably without running out of SP halfway through the quest)

I may be asking a lot, but to be honest I got a rather nasty surprise when I found that most of my spells simply had no effect against demons and I really want to be prepared for them (and the Vol thingies) next time around.. So any and all help would be very appreciated..

Thanks in advance..