So, I made a way to make Croaking demons with just a handful of dice.
(actually, while finding the links for this article, I discovered that Croaking Demons are actually part of a hierarchy, and probably shouldn't have quite so variable or impressive stats, but I'll come back to that another day. When I do, the creatures detailed here will be considered to be the more powerful Slime Frogs or something)
Grab 2d2, 2d4, 2d6, 2d8, and 2d10. Also, get your mutation chart of choice (from any vaguely compatible product. I suggest the chart from the Miscellaneum, or from the old Polyhedron Omega World article, if you have access to those), and two of whatever kind of dice that chart needs.
- The higher d10 result is the demon's number of hit dice.
- The lower d10 result is how much less damage the demon takes from energy attacks and nonmagical weapons (except Cold, which croaking demons take normal damage from, and Acid, which they're immune to)
- The higher d8 is the bonus to the demon's AC (also add half its hit dice if you're using a 3.x or later version of D&D)
- The lower d8 is the bonus to demon's hit points (applied once for old-school games, applied per hit dice for 3.x and later games)
- The higher d6 is the demon's strength bonus to damage rolls (if your game uses that sort of thing)
- The lower d6 is added to the demon's hit dice to get its attack bonus (if your game uses that sort of thing)
- The higher d4, multiplied by 2, is the maximum result of the dice rolled for the demon's secondary attacks (see below). Example: rolled a 3 x2 = 6. The demon uses 1d6 for secondary attack damage.
- Both d4's together, multiplied by 2, is the maximum result of the dice rolled for the demon's primary attacks (see below). Example: rolled a 3 and a 2 x2 = 10. The demon uses 1d10 for primary attack damage.
- The 2d2, added together, are how many attacks the demon gets (usually claws, bites, or tongue-whips). If it has one or two attacks, both are primary. If it has three or four attacks, one is primary, the others are secondary. (and get -5 to attack for 3.x and later games).
- Now roll twice on that mutation chart you found for yourself, and apply both the mutations to the freshly minted croaking demon, and you're done!