The Corruption of Middenheim
Solid Wind Stone
If warpstone is the solid version of the winds of magic, then Solid Wind Stones are the solid version of specific winds. Wind Stones are formed when winds of magic pass from one dimension to another. Most are formed at the Warp Gates at the poles, but when a Chaos Storm occurs, some stones can be found as well. While the magic inside cannot be released through normal means, Wind Stones are a powerful ingredient in color-based rituals, potions, and enchantments. Due to the radiant nature of these stones, anyone with Magic Sense can make an INT check to detect one of these, even if hidden.
Making one of these is quite simple, provided you have a way to jump dimensions. Simply jump, and tiny amounts of Wind Stones will be formed. If you can open a portal, this generation happens on a larger scale. Sadly, keeping a portal open gives fewer and fewer stones, making this a somewhat time-consuming and difficult process.
Since these stones are slightly translucent, many mages have started describing them like you would gems; a 10 GP stone would be like a 10 GP piece of quartz. This doesn’t actually describe its value, but it gives an idea as to the size of it.