Ability Scores for Monsters

Another way to modify standard monsters is to assign ability scores to them. This method is more time consuming than applying a simple modifier to make the monster bigger or stronger, but it allows for greater variety. Generating ability scores for a monster also makes it possible for the creature to undertake actions during an encounter that might require an ability check, and it makes opposed checks between monsters and characters possible. (How likely is that fighter to win a tug-o-war with a giant toad?)

The system presented here is intended for use with nonhumanoid creatures (humanoids are best treated as characters, see The Complete Book of Humanoids for extensive examples), but it can be used with any creature in a pinch. Start by noting the Size and Intelligence ratings from the creature’s description. These two ratings determine the range of ability scores the creature can have (see Tables 6 –11).

To generate an ability score, roll 3d6 on the appropriate table and read the result from the applicable column. For example, a rust monster is a man-sized creature with animal Intelligence. To generate a Strength score for a rust monster, roll 3d6 on Table 5 and read the result from the M column; a roll of 10 yields a Strength score of 12. To generate the rust monster’s Intelligence score, roll 3d6 on Table 8 and read the result from the A column; a roll of 18 yields an Intelligence score of 4—an Einstein among rust monsters. The creature gains all the bonuses and penalties associated with its actual ability score as listed in the Player’s Handbook. The notes below contain additional information.

When you have finished generating the creature’s ability scores, it might be necessary to recalculate its XP value according to the rules in the Dungeon Master Guide, Chapter 8. For example, a creature with high Constitution score probably has greater than average hit points and should have a higher XP value than its less robust cousins.

Strength: Except as noted, all modifiers apply to creatures in the same way they do for characters. Creatures gain the warrior combat bonuses for high scores.

Damage Adjustment: The bonus or penalty applies to the creature’s natural attacks. If the creature rolls multiple dice to determine damage, the bonus or penalty applies to the total, not to each die.

Weight Allowance: Add 35 pounds to a creature’s weight allowance if it is large, 70 pounds if it is huge, and 105 pounds if it is gargantuan. If published rules list a carrying capacity for a creature, use either the listed capacity or the modified weight allowance from the creature’s Strength score, whichever is higher.

Open Doors: Size L and larger creatures can use this ability to batter down or smash holes in simple wooden walls.

Bend Bars/Lift Gates: A creature that can bring its full bulk to bear on an object gains the following bonuses by size category: S or M, 0; L, +5%; H, +10%; and G, +20%. Exceptionally sturdy objects built to handle heavy loads or restrain large creatures negate the bonus. For example, a griffon would get the bonus when straining against a normal rope but not when pulling against a rope made to anchor a ship.

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