|XP - 15|
|Drop - 1-2 Redstone|
|Health - Takes anywhere from 10-15 hits without a sword|
|Attack - Fireballs similar to blaze.|
|Spawn - Nether, and in the Overworld (when set on Hard)|
Fire Wraiths are red-colored ghostlike mobs. They are very similar to the wraith, the only difference being their color, as Fire Wraiths are red.They give off sparks of light similar to that of torches, which makes them very easy to spot from a distance. They appear to have the same attack pattern as the blaze, they will fly in the air out of the range of a sword if attacked. They only spawn on Hard difficulty, unless changed through the GUI Menu.
Source - Minecraft Forums