The Scotch Assassin |
Amorphous Form As a mass of caltrops held together by magic, a caltrop golem may squeeze through any space of diminutive size or larger without penalty. Also the golem’s amorphous nature makes it immune to critical hits, sneak attacks and other precision based damage. A caltrop golem may also spread itself out in a 15 foot by 15 foot square of caltrops and move at its normal movement rate. It may take no actions except to move or reform (a standard action) in this form.
Pretty much won my vote right there. I think this is well done. And the fact it can just appear as a bed of caltrops the party is trying to get around then WHAM! Golem time. But after that is is one of the few critters i thought that could be done well with such a low ceiling on the CR and you passed with flying colors.