Ethereal Rift

While not many know how to purposefully cast this spell, there's not much reason to know in the first place, other than knowing what not to do. However, this spell is still cast fairly often, usually by complete accident at the hands of a novice spellcaster trying to mess around with rituals. While its casting can be triggered by a few other methods, it is known that a large and pure enough quartz crystal coming into contact with a magical item can cause it, so long as the caster is unluckily at a weaker spot in the Ethereal plane.

When such a meeting of magic and weakened boundaries occurs, the reaction violently tears a 60 ft. rift between the Material and Ethereal planes that pulls everything in the area of the each plane through the rift and into the opposite plane. Any entities caught in the maelstrom take 4d10 force damage from the shift. The rift also leaves behind a dead magic zone in the affected area for 1d12 days.