Cleon
Legend
Great idea on using the construct bonus hps.
Updated.
CR 9 is probably workable, but note that they do have the poisonous breath of the larger iron golem.
The construction looks fine to me.
Are we finished?
Oh blast, I must have got confused somewhere. I was sure they didn't have poison breath.
I'm starting to lean towards thinking they are worth CR10.
They have a mighty good AC and DR for a creature with 12 Hit Dice, plus immunity to magic. Not to mention they could be auto-repairing by standing in a fire.
I suspect they would be very hard monsters to kill.
Also, why is their Trip modifier +17? It should just be a +7 bonus from Strength, were does the extra 10 points from?
Oh, and their bite attack and grapple should both be +16 melee, not 15 - 9 BAB plus 7 for Strength. (I think we forgot to change the numbers after upsizing the firedog from Small)