Yes, I did a lot of testing.
Most of things in this room are illusions, except for the pit in the middle and the fireball spawning (the mobs spawning actually often protects you from being hit.
By "Neta portion" you mean
ful bro neta spell,right ? Not the
ya bro neta potion (which is just a vitality potion, indeed, no use in this room) ? The effectiveness of
ful bro neta depends on the power rune used to cast this spell (with a mon Fireshield, i take 0 damage from those fireballs, with a naked Wuuf (well Wuuf is as naked as a dog priest can be -
furry would actually be more appropriate).
TIP :
If your priest level is too low to cast a powerful fireshield, you can cast multiple weak Fireshields in a row, their effectiveness actually stacks . I just tried casting 6-7 lo ful bro neta spells, and still, 0 damage. Not a single Wuuf-hair was harmed in this process. Remember this, you may find it useful against specific foes. The poisons clouds should not be a problem, as all you have to do is rush through the room and grab the gem
EDIT : Excuse me if you find all this to be too much challenging, I hope it do not spoil your adventure
(the kind mummy left an explicit message on the scroll, though :p)
You'll have noticed that this level's purpose is to "test" the party's ability in each of the four classes. The last "trial" is dedicated to priests, obviously
EDIT 2 :
May i know what difficulty level, starting characters/items you picked ? And your actual level/stats ? Did you do some training ? A little feedback would help me adjusting things, and making the difficulty increase "smoother" . (Although I ran some tests with "regular" characters, I obviously know the secrets area which, therefore, grant me quite a few helpful gears.)