I'm enjoying your campaign description, Forrester.  Let me see if I can distill down a few "little changes with big flavor" (and some more general DM tips) from it:
				
			- Have no safe haven, no Village of Hommlet, to return to.
 - Invert which races are good and which are bad. Play the Orcs, Goblins, and Kobolds against ruthless Elves.
 - Have the enemy play rough and play smart. Have them use tactics and magic as PCs would.
 - Don't match every encounter to the PCs' abilities. If the enemy's caught off guard, they should be vulnerable; if they know what to expect, they shouldn't be.
 
			
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