Rune of Roars is a space-elemental master arts introduced in the Trails Universe from Ao no Kiseki.
With a Space Master Quartz installed, the user calls upon the power Space Sept-Terrion to activate the art. The caster is enclosed within a glowing circle outline being the central core of the magic circle surrounding the entire battlefield.
As the caster remains in place to preserve the circle, all other party members gain physical immunity upon the art's activation. In addition, they recover HP by 20% of the damage dealt per offensive arts cast.