The Corruption of Middenheim
A transluscent stone, anti-warpstone (also known as prismatite) is a very rare magical item. While warpstone releases all colors of magic and produces Chaos, prismatite absorbs all colors of magic and slowly removes Chaos. It acts as a personal anti-magic zone for anyone who wears it, able to absorb half damage from magical attacks and adds a +20 bonus to magical Willpower tests.
Combining Warpstone and prismatite causes an explosion, dealing D6 damage at strength (GV* / 100) and removing equal parts of each stone. Naturally-occurring prismatite is extremely rare, so many mages have produced it using Coalesced Mana, Solid Wind Stones, and a ritual to combine them.