Ah, gotcha.  I've been pegging them at about "level 2" for stats other than HP, so I've been doing pretty much that already.  I'm not going to try and make a system for it though, instead just have individual monster blocks for now.<br/><br/>Though yes, bigger monsters will mean more tentacles.  I'm plotting an upcoming "boss fight" with a big monster with something like 15 tentacles.  (And yes, they'll have some of those different abilities I mentioned in the rules update...)