Advancing Creatures

[DanMcS]

When adding HD to a creature, does it gain +1 to a stat every 4 HD like a character advancing in levels? It seems like it should, but the MM doesn't say anything about it. Also, how do you go about fudging the new creatures SR, DR, that kind of thing?

 

[Mr Fidgit]

i don't think so...

using the creature advancement only makes a tougher and possibly larger, it doesn't reflect the experience gained by advancing in character levels (i.e. the creature isn't practicing, working out and increasing its abilities, it's just a bigger version) and it leaves specific stat changes to changes in size (affecting Str, Dex and Con allong with natural armor, AC and attack)

the MM even states: "This book only lists the weakest and most common version of each creature."

the otyugh advancement example even states that the monster's CR doesn't change with the advancement (but the number of experience points gained does)

if you were to add stat changes (above and beyond changes due to size) and increase SR and/or DR, i would recommend increasing the challenge rating as well

 

[Dr. Zoom]

the otyugh advancement example even states that the monster's CR doesn't change with the advancement (but the number of experience points gained does)

That was errata'd. The CR does change by +1 for every full 50% by which the HD increases. So in the otyugh example, the HD increases from 6 to 15, which is a 150% increase, so the CR increases by +3, from 4 to 7.