Focal stone

Focal stone was a divine alteration spell from the elemental earth sphere that allowed a gemstone to hold a dweomer.

Effects
The stone in question could not be larger than the caster's balled fist. Gemstones of higher quality stood a better chance of success. The spell dweomer was usually added via dweomerflow. All focal stones, regardless of the spell they held, could neutralize poison if placed into the liquid and commanded to do so. However, doing so would destroy the focal stone. Shattering a focal stone would release the full effects of the store spell.

Components
In addition to verbal and somatic components, this spell required as a material component a pinch of opal dust.

History
This was an extremely rare spell on Toril.