Spellbinding amulet
ReVi 15, 1 use/day
R:Voice, D:Ring, T:Circle
Once per day, tracing a circle with this amulet of silver-banded cinnabar allows any spells within the circle that are being maintained through concentration to persist even after concentration lapses, for as long as they do not leave the circle and it remains unbroken. The amulet lacks sufficient magical puissance to sustain spells above level 10, but it can sustain spontaneous spells. Indeed, a common use of this amulet is to allow a magus to effectively produce D:Ring "persistent" spontaneous effects one magnitude higher than he would otherwise manage, by casting them at D:Conc and sustaining them through the amulet.
Base 3 [Sustain spell cast by another of level up to half (3 + 5 magnitutes) = 20/2], +2 Voice, +2 Ring, +0 Circle
Cinnabar as an enchantment material yields a +3 S&M bonus to "long life" of the spells maintained