Benefit: The magus may expend two points from his arcane pool to scribe a rune of power on a 2-handed weapon with which the magus is proficient. While the rune is in place, when the magus is holding that weapon with two hands, he can use one of the two hands holding the weapon to complete somatic components of magus spells he casts, and it is considered to have one hand free for purposes of spell combat. The rune lasts 10 minutes per level.