Magister Winonin:
The collection of a soul doesn't always
go as planned. Some evil souls will simply not be absorbed, and, if you happen
to collect the wrong soul, the crystal will shatter...
Soul Crystals develop
refined tastes, and will reject weaker souls after a while. When this happens
you must seek the souls of creatures of greater evil to satisfy your
crystal.
Remember that you may not absorb a soul with more than one crystal
because a resonance effect is created between the crystals that prevents proper
absorption.
Receive a soul
crystal.