It won’t burn?
What, not even magical fire? But it is such a little monster.
In Pathfinder (like 3.x before it), there are a number of monsters, and some classes, that gain flat and total immunity to a variety of things. This was brought back to my attention by the comments on my review of the Genius Guide to: Fire Magic and has been discussed as a problem by Sean K Reynolds (and possibly others).
Immunities are just no fun, not for the player, not for the GM, not do they make a lot sense. Sure, the King of the Fire Elementals cannot be harmed by fire, that makes sense. But should not a 2HD small fire element be washed away by a powerful enough gout of flame? Cannot a creature of electricity be ionized if overwhelmed by a massive stroke of lightning?