|Duskruin is current Gemstone IV paid adventure|
D&D 3.x fixes this with challenge ratings. It works pretty well, with the exception of creatures with special powers. They don't seem to have the appropriate CR assigned to them.
Gemstone IV has a different method of ranking for creatures. Being a MMO, your character can literally walk up an incredibly high level creature and get turned to dust. That works for an MMO where you have the concept of "extra lives" but it doesn't really work on the tabletop.
For more evenly matched creatures against the player, there is a sliding scale. A first level character against a 1st level creature is worth 100 experience. A second level character against a 1st level creature is only going to give the PC 90 experience. By 11th level, it's kind of pointless to fight 1st level kobolds and as a consequence, they don't give any experience any more.
I like that. It creates a coherent world. At 10th level and beyond, fighting kobolds shouldn't be the point for AD&D and D&D characters. They are so past that. Kobolds don't stop existing, they merely cease being something the player should fear. While you can ramp up the numbers and abilities of kobolds, they still aren't intellectually challenging. A zillion of them merely represents a zillion chances to roll the dice. That stops being a story real quick.
I tend to use the formula 10 equal level encounters should equal one level. A party of 4 characters fighting 40 equal level monsters should be one level of experience for each player character. What this does is enable me, the DM the ability to pace the party. Do I want 40 monsters all at once or 10 groups of four? Probably someplace in between.
This builds a coherent world in my mind. On day one, a nasty encounter with a kobold patrol is fine. Six sessions into the campaign, sure, my players encounter that patrol of kobolds but they are super leary of mixing it up with the players. 10 sessions later and the party may be hiring them as man-at-arms, porters, etc. The kobolds didn't disappear, their role changed because they aren't a challenge.
I kind of like that concept and generally use it over mathematical gyrations provided in the DMG.
As a consequence, it does break the model of gold for experience, but I never liked that anyway. Fighters don't go to fighter school to level up. As they gain experience, they gain followers who make them explore the concept of their trade as they teach others.
Having a simple rule of thumb allows me to plan more fully. Not just what sort of monsters the players will defeat, but also what sort of resources they players will encounter. If the party plows into a patrol of monsters, chases them home and has the tribe bribe them not to attack the village, that's a win. It is total defeat for the monsters, perhaps dozens of them because they offered surrender or capituation.
This allows me to control what resources end up in the player's hands beyond having them scoop up piles of treasure and hoping for a random roll. I know what is on the table and can use the interactions between the party and the challengers to guide the party. Gold is gold, but this method leapfrogs the concept of magic swords and other nice prizes. A tribe of kobolds might offer up a nice +1 two handed sword to escape the party's wrath because it's a six foot long weapon for 4 foot tall creatures. It's not valuable to a kobold. Plus the kobolds can hint at it's power so as not to waste the party's time trying to identify every item that comes to them.
It's a nice feature because it establishes a history of what happened. In the above example, the kobold tribe doesn't have to be obliterated to represent victory over 40 kobolds. They can come to an agreement with the party that in exchange for the sword and a promise not to raid the town anymore, they can live in (a fragile) peace. The party know they are there and can sometimes draw resources from them. A safe place to sleep, a good gossip starter or perhaps something else.
Stolen ideas are good. Why don't you join me in the world of Gemstone IV by clicking the link below. GSIV has a nice F2P model that will give you a taste of an expansive world of magic.