I finally got this after 4 hours of trying. Normal 3:49s
Some hints:
Do on normal.
Create party, dont use premades. Do this Fast, if you take longer then 40s to be ingame you wont clear the level in time.
once you have done your characters press ESC key to bypass intro.
Party=
2x human warriors - 16 str, 17 dex, 4 points in unarmed combat. Traits= Agile & Fist Fighter
2x human mages - Max out Willpower and dont worry about other 4 points = 16 Willpower. 2 points in both Fire and Spellcraft. Traits= Aura & Strong mind.
As soon as your in the game press escape, check your statistics for time, if its over 40s do it all again.
Once you have it done in 40s, save this as DR-01 or whatever you want to call it...
Now the idea is to do segments of the level as fast as you can.
Start to 2nd iron gate = 48s
2nd iron gate to switch on 3rd iron gate = 54s
3rd iron gate to 4th iron gate = 1:09s
4th iron gate to key in wooden door = 1:22s
wooden door to switch for iron gate = 1:27s
From there you have to kill 2 snails, retrive key, then unlock wooden door = 1:56s
Now head left and retrieve first Gem. Fight only 2 snails. When you come back from there and are standing in line of sight with the Gem face it should be 2:35s
Now head right side. Kill 3 Treemen and retieve the other Gem, come back and open Gem door = 3:23
Dont fight the Skelly just backup till you can get past it then run like crazy to stairs.