I have been searching the internet some time now, for a walk-through of
'Hordes of the Underdark', and haven't managed to find one.
Does any of you know a link?

In NWN2 from time to time 1 or more characters will just stand still and
not follow me.  They appear on any map I travel to but, not move after
that.  They are not in Puppt Mode and I can still make go where I want
but, they don't follow.  If I go back to the Tavern in NW and ...

Ok I have Sand in the party, where can I to buy some good spells for
him?  I can't find any spells that do damage, not even low level spells
like Fireball.  I am in Chapter 2
TIA