Siege Perilous
Off to the Enchanted Forest where you must rescue Dhyana Castle for the good sorcerers, currently under siege by the evil archers. In other words, it's an extermination level!
When you come upon the castle, cross the drawbridge and up to the gate (it's a time delay before opening)
Upon entering the castle, try to kill the clerics first (you should be able to sniper one on the rampart before entering the castle)
Blast the archers away, enter the throne room and flip the switch behind the throne
After the secret door opens, follow it back to the pod, read the term and save
Head back out and start killing archers, including the ones in the watch tower
Use the cave path from the throne room to locate the waterfall where you can find some water vials
Be sure to clear the dining hall and the ramparts
Follow the rampart into the cave wall, and continue through the caves until you drop into a bigger cave with a door
Enter this door to the Alchemist lab, avoid the potions and just walk to the end of the room until the shadow sorcerers attack
Kill the shadow sorcerers (they'll probably drain you, but they won't kill you)
Now drink the 2x potion, grab the key, and head through the door near the magic staffs
An ambush awaits you in the hall of knighthood, afterwhich you can use the key to open the fireplace passage
Take the passage back to the castle dining room
Return to the throne room, to the pod behind the throne, and if you've killed every baddie (you're allowed 4 to live), you'll teleport to the next level
Eye Candy / Extras
Drop into the moat and go to the left, through the waterfall, and you can take the caves to the Alchemist Lab from that direction as well
Drop into the moast and go to the right, past the crystal stream, and you can drop into the waterfall where the water vials are
At the bottom of the tower next to the rampart is an armory with some extra ammo supply