Shoots a fire attack that damages all creatures (except those immune to fire), and players, within a large circular area centered around the square where the GFB is targeted. The damage area will be a total of 37 squares, as shown in the picture, unless some of the squares are obstructed. The player using the GFB rune is never affected by it.
Note:
This rune is really useful to get rid of big groups of monsters when the character gets surrounded or when you need to clear a room. As the Magic Level raises, the rune will become more effective, to the point that sometimes, the FB rune will be enough, which allows to save the GFB to harder situations.