I wont comment on whether a ghost trapper can even get to hell let alone clear hell. Fade can be gotten from other items/weapons on switch and at best is a one point wonder, though some people only ever use it when facing the ubers or maybe champion gloam pack.
Be very sure you want to waste any points in fade before spending them.
You wont have too many difficulties with LI's really. Any LI's/PI's that you encounter (very rare) can easily be avoided if the 3 of you cant deal with them.
1) Get a lower resist wand from the vendors. use this on LI's. It breaks most of them and easily killable.
2) if it doesn't break the immunity, get a corpse happening and just Death sentry the lot of them.
3) If you cant do either of the above, Mindblast them to bits.
4) If all else fails, use the sins incredible BOS and just move on to the next mob.
Fade: This skill is what help give the Ghost her name. With this nifty aura on you look translucent...kinda...cloaked like the Terran ghost units in Starcraft. You don't turn invisible in D2 with this aura, but you do gain a LOT of resistance, and gain 1% DR per skill level! On top of that curse duration gets cut by a lot too. This is your primary aura. Now, depending on how safe you feel (and depending on how much resists your other gears give you), you may want to max it, or leave it at as little as 10 points! Personally I invested 12 in it, and my +skills boosted it to 20, and I'm happy with it at that level I think. 10-20 points.
What a pile of willows. A trapper is a caster not melee, so the 1% DR is pretty useless and also easily obtained by gear.
The extra res is good against the ubers, but otherwise a few charms and this is also covered.
The translucency does look really cool, but we have to sacrifice this 'coolness' in order to kill anything!
