Type: General
Source: Frostburn
Your special mount is native to the frostfell.
Prerequisite: Special mount ability.
Benefit: Your special mount gains the cold subtype. It gains immunity to cold, but has vulnerability to fire, which means it takes half again as much (+50%) damage as normal from fire, regardless of whether a saving throw is allowed, or if the save is a success or failure.
Your special mount is also hardier than a nonfrostfell version; it gains a +2 racial bonus to Constitution.