Mnemonic Crystals CR 3
Mnemonic crystals are large (2–4 feet tall) clusters of violet quartz crystals that radiate a strong abjuration aura. They can be identified with a DC 25 Knowledge (arcana) check. Attuned to the unique energies of spellcraft, mnemonic crystals harvest magical energy for growth and defense. The crystals drain prepared spells from spellcasters within 30 feet, who must make DC 22 Will saves each round while in the crystals’ area. Failure results in the loss of one prepared spell, chosen randomly. Spontaneous spellcasters such as sorcerers are unaffected. Damaging or breaking the crystals causes them to release their absorbed spells in a burst of mental energy that does 1d6 points of Wisdom damage to all creatures in a 10-foot radius. Mnemonic crystals are exceedingly fragile (hardness 0, 1 hit point). In areas thick with the crystals, creatures passing through must make DC 10 Acrobatics checks to avoid stepping on or brushing against the crystals and breaking them.
Pathfinder RPG GameMastery Guide, © 2010, Paizo Publishing, LLC; Authors: Cam Banks, Wolfgang Baur, Jason Bulmahn, Jim Butler, Eric Cagle, Graeme Davis, Adam Daigle, Joshua J. Frost, James Jacobs, Kenneth Hite, Steven Kenson, Robin Laws, Tito Leati, Rob McCreary, Hal Maclean, Colin McComb, Jason Nelson, David Noonan, Richard Pett, Rich Redman, Sean K Reynolds, F. Wesley Schneider, Amber Scott, Doug Seacat, Mike Selinker, Lisa Stevens, James L. Sutter, Russ Taylor, Penny Williams, Skip Williams, Teeuwynn Woodruff.