Going to reduce the amount of levels from 20 to 16. 4 levels per zone.
Content progression will still roll out over 20 levels. But it will pick 4 from 5, then the last will be added to the pool for the next zone and so on. With the balrog and underworld portal also starting at 16 (or perhaps at a random level in Chaos), it could mean you could play the whole game without experiencing some of the content - unless you stored it in the Overworld.
It's a tough choice but I think this will help the pacing/replay and let me throw in a big sprawling level at the end of each zone.
The big levels will have an elite character to fight in them with extra health, a special ability and nice loot. I'm planning on one elite character to represent each race. So far I've got:
Balrog: The Balrog, can use stairs, the boss of the game that has the amulet of Yendor.
Drow: Crowley, regenerates health, all of my MMO characters are named after my Baldurs Gate evil-elf-cleric.
Kobold: Pun Pun, max kobold stats, named after
the most powerful character ever.
Vampire: Edward, sparkles, yeah, enjoy killing him.
Goblin: Golfimbul, always suffers decapitation, after the lord of the rings character whose fate allegedly gave rise to the game of golf.
Troll: Forchan, level 20 regeneration - will prove difficult to kill. May have him call you a faggot.
Nymph: The Bitch, always succeeds every steal attempt.
Gorgon: Medusa, attack inflicts slow as well as stun.
Suggestions for the remaining races are welcome.
I'm also boosting equipped monsters health (champions) - if you see them with weapons/armour, it will mean an elite or a champion - and a worthwhile fight.