Cleon
Legend
That's a good start. Let's stick with the 1d8 fire mentioned in the original. I could also see reducing the bite damage to 1d3 like the original, as a swallow isn't a match for an eagle.
Added to Homebrews.
It looks like its fiery aura combines two of the magmin's abilities...
Combustion (Ex): Anyone a magmin touches must succeed on a DC 12 Reflex save or take an extra 1d8 points of fire damage as clothes ignite or armor becomes searing hot. The damage continues for another 1d4+2 rounds after the magmin’s last successful attack. Magmins can also ignite flammable materials with a touch. The save DC is Constitution-based.
Fiery Aura (Ex): Anyone within 20 feet of a magmin must succeed on a DC 12 Fortitude save or take 1d6 points of heat damage per round from the intense heat. The save DC is Constitution-based.
Something like:
Combustion Aura (Ex): Anything within 5 ft. of a flame swallow takes 1d8 points of fire damage per round from the intense heat (DC X Reflex save for half damage). If a creature fails the Reflex save any flammable materials they are carrying will burst into flame. The save DCs are Constitution-based.