So, here’s the table I created to use as a reference when creating monsters on-the-fly for your campaigns. There are a couple of notes you should be aware of right off the bat, and the first of those is that this table is largely untested. This is not to discount my ability to do math but I’m going to insist that using this table is at your own risk.

[Dee Point Five Creature Statistics]

I have referenced a handful of late-edition monsters to perform a sanity-check on the system. The numbers on my table line up pretty well with those found in the Fiendish Codex I: Hordes of the Abyss, which was published late in the run of Revised Edition, and should be consistent with more realistic expectations of player power.

Now, because my table uses neither Challenge Rating nor Hit Dice, I want to offer a couple of suggestions: first, when facing undead, treat them as having Hit Dice equivalent to the level of your cleric or party (or the level of the monster you’re using). You can use monsters of a level or more than the party with less stress.

Second, these monsters have fewer hit points than their Third Edition predecessors, and that is to encourage the Fourth Edition encounter design of “one creature per character.” When you throw zombies at the party, use creatures equal to the number of players, give or take a few. If more, make them a slightly lower level.

Also use this table for the design of Non-Player Characters (NPCs), with the following guidelines: don’t bother with the majority of class features, equipment, spells, and feats. Seriously. Just don’t bother. The whole point of the table is to make things easier for you. If you’re an optimizer, I guess you can go for it, but it isn’t necessary.

What I do advise, however, is picking one or two particularly interesting and/or flavorful feats, class features, or spells, such as smite good/evil, magic missile, or any of the many, many things found the in Third Edition library, and add just a couple of them to the character to make them special. The bonuses aren’t necessary though.

You may have realized that the similarity to Fourth Edition now makes it possible to apply monster roles. Knock yourself out. I mean really, why not? Give a striker +2 to attack and +4 to damage, use the lower hit point numbers and the higher damage numbers. It’s all good. For a soldier, give them +2 to attacks and defenses.