This rune circle empowers a gnome bard to defend the area against incursion from outside, thanks to the ability to charm a creature that passes near it. The circle is a 20-ft-radius circle of runes on the ground.
Aura: Strong Enchantment
Benefit: A gnome bard in the circle can use one of their uses of bardic music to cast charm monster with a caster level equal to the level of the class that grants them their bardic music ability.
Construction: CL 12th, Craft Rune Circle, bardic music ability, charm monster, creator must be a gnome; 15,000 gp.