Level 30 is a little low. Do you have any saves from before you entered the Hall of Echoes?
If you left anything unfinished you might want to reload and go do that first. You should still be able to do the Hall of Echoes at level 30, though, it just will not be as easy as if you were another couple levels higher.
From the dragon sections of the Hall of Echoes you should be able to return to the battle tower and adjust your enchantments, add charms, etc. The teleporter there will be disabled, though.
The Hide in Shadows skill might help, though at level 30 I don't know if you could rely on your creature and summon to do much damage (they may at least act as a diversion). A Stun Arrow, or possibly a Rush Attack, or something, might let you finish them off before they can hit you. I think it is Razakel that uses the instant magical attack, but it has been awhile since I played D2:ED, and I am not quite up to that point in DKS.
I think you will have to go after Laiken and Razakel first. The longer the fight lasts the more chances they have to hit you with the 1500 damage spell. I was level 36 at the end of D2:ED, so the arena fights were not terribly challenging, and I could take out the Memory Eaters first.
If you're playing DKS, there was a bug where certain opponents could have over-powered attacks.
The
patch will prevent this problem, but unfortunately if it has already occurred in the save it will not undo it. However, if you email your save to support@larian.com with a description of the problem, they can fix it for you.
One person who ran into this problem (with the PC version) used CheatEngine to fix their health until they got past Ba'al (someone mentioned that Steam may have a problem with the use of CheatEngine, though, even with a single player game). A couple trainers were mentioned in the topic
Horrible trouble with platform jumping (there are probably versions for D2:ED, as well).
Where's the trick to Ba'al?[Not Sure if Bug][Spoilers]Killed InstantlySee Lar's post
here on how to send them an Xbox save.
With the PC version, in XP the saves are in the folder
C:\Documents and Settings\ %username% \Local Settings\Application Data\Divinity 2\Savegames
or in Vista / Win 7
C:\Users\ %username% \AppData\Local\Divinity 2\Savegames
You may need to set Windows Explorer to show hidden files and folders (
XP, Vista,
Win 7).