This spell allows the Black Order Mage to craft a Rune of Summoning, a magical item that makes it easier to summon and control creatures called up with magic. The Mage must first craft (or have crafted) a small clay tablet into which certain symbols are placed using the Marking spell. Once the tablet is ready this spell is cast three times, on three successive days, using value 7 worth of materials in total.
The finished tablet, if carried by a spell caster, enhances any spell with the Summon keyword. The difficulty of the spell is reduced by 4, and any roll needed to control the summoned creature has a +1 Bonus. If a creature summoned with the use of a tablet breaks free, or turns on the summoner, then the tablet is destroyed.
It is also possible to use this spell to enhance the Mage's own summonings, without making a tablet. To do this the Mage marks the Rune of Summoning on the ground, and then casts the summoning spell afterwards while standing on the Rune. This gives the same bonus as a created tablet would give to another Mage, but for one use only.