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Enter the door then next to a room where rocks fall from overhead. Pass them,
go to the entrance to find two dead ends. I was stumped on this for about 5
minutes before I discovered the corridors' secret. Turn right to go to that
dead end. Look carefully at the wall. Looks like a normal wall, right? Turn
around and go to the next dead end, the one left of the entrance. This one is
peculiar...it seems like its moving horizontally! That's because its only an
illusion, and a badly drawn one at
that. Simply walk right through it.

Use Force Speed to pass the flame-throwers and you'll find Desann going through
one of three entrances. The one at right contains another illusion wall, but
past it is a bottomless pit. The one directly in front of you has only a
mirror with Desanns reflection taunting you. So, the left one is the only
option. Only thing is, there's fire blocking it. You cannot jump over or go
through it without being killed. Think, think, think...what's used to put out
fire? Water of course. But, where are you going to get that? As you pace
back and forth along the corridor, you may notice some drops of liquid falling
to the floor. Ah-ha. Use the lightsaber throw to sever the pipe to let out a
flow of water to put out that troublesome fire.

Drop down the hole. In here, push on all the walls to make them recede, then
enter the new left corridor. Turn right then notice a symbol pad on the wall;
push it. It will open a dead end. Enter through that, use Force Speed to pass
the things that want to squish you, and at the end you'll find Desann.




ARGH! This fight is SO INCREDIBLY EASY! Man, final bosses are supposed to be
HARD! I finished Desann off on my second try. Jeez...he's almost as easy as
Nihilanth from Half-Life. His main attacks are usual for shadowtroopers, but
his Force Push and Pull powers are ridiculously strong. There are health's all
along the above ledges just so you know. To defeat him, set your lightsaber
style to Strong, then set your Force quick key to Speed. Use Force Speed and
slash him with your powerful lightsaber until he dies. However, while in
between using Force Speed, Desann may grab hold of you and throw you around the
chamber, not letting go. What he's doing is he's using Force Grip and banging
you against walls, much like you do to stormtroopers . Use Push or Pull to
stop this, and he'll fall down. Other then that he's no toughie.

quote gamebanshee.com

4) Rancor Beast:
This is a large room containing one huge corpse pile and one huge rancor. You can actually defeat the rancor in battle with careful use of grenades and skill (for 650xp - thanks GuitarSam), by planting mines using Mission, or you can kill him the easy way without much risk of death. Put your character on Solo Mode (the Back button), and walk over to the corpse pile not too far from the entrance to the room. It's right in the middle. You won't bother the Rancor this far away so you won't need to go stealth. Activate the pile, take the items inside, and activate it again. Press the X button to Give Items to the pile. Give it the grenade of your choice. The window will close. Now activate it again, and give it the "Synthesized Odor" you found on the severed arm at area #3 for 200xp. Watch and enjoy.