had a really hard time there, too.
Teleport Gloves and jumping skills were useful.
Try to move Forward with the Charakter which can move best and unite with the others one by one.
You should do the master siva quest before you go to the cave and buy a lot of potions and scrolls before you go down there.
Had to try it 2 times, after i was too weak the first time (wasted like 2 hours :D)
