Cleon
Legend
That works roughly. I might boost the Str a bit given that it has a good chance to break the chains. Or maybe give it a Rage ability, or both.
Hmm... it'd need at least Strength 22 to bust standard manacles' Break DC 26, or Str 26 for masterwork manacles. That's too high methinks.
Remember it'll probably have 10 primary attacks with its tentacles - do we want to give it a +6 Strength bonus to all of them?
If it bothers you, I'd rather give it a bonus to Escape Artist for being so "blobby", or possibly some "burst free from confinement" SQ.
I guess it should also have some sort of shape-changing or tentacle-growing ability.
Are you suggesting something like the Alternate Form of the Pseudonatural Creature?
Alternate Form (Su): At will, a pseudonatural creature can take the form of a grotesque, tentacled mass (or another appropriately gruesome form), but all its abilities remain unchanged despite the alien appearance. Changing shape is a standard action. Other creatures receive a -1 morale penalty on their attack rolls against pseudonatural creatures in this alternate form.
Hmm... we could change that so instead of a morale bonus, it fluctuates in size so violently when using its alternate form that it gains a hefty racial bonus to burst out of chains, manacles, and other confinements.
That would have the benefit of sort-of-matching what happened in the adventure.