Conversion Rules

Health

Normally this is the creature’s Level times three. Adjust a monster’s Health if you think it should have more

Armor

Basic formula can be (AC - 11) ÷ 2 (drop fractions) when going from AC to Armor.

Exception is if you think a creature’s high AC is due to being able to avoid attacks particularly well, it’s better to give them a higher level on their Defense. For instance, the ghost is listed as having AC 20. I’m sure that you don’t want to give them Armor 4. Their Defense Levels are probably one level higher than their overall Level.

Damage

Damage is normally equal to a monster‟s level. This is fine. If an entry gives “or by weapon” you can use the appropriate weapon used. This prevents goblins from doing only 1 damage all of the time.

Once again, if you think it should be more or less, you can adjust this on the fly. Any special abilities the monster has will use a Level equal to the monster‟s overall Level. So, if a creature has a “Save or Die” poison, then its Poison Level will be equal to the Level of the creature. But it‟s really a “Defend or Move One Step Down on the Damage Track”. Level drain can operate this way as well (which makes it particularly scary).

You don't have to convert every special ability, but if a creature has some sort of signature ability, like paralysis for ghouls, it should have some sort of presence in the game.