Incantation of Summoning the Dead
Incantation of Summoning the Dead is a Rego Mentem ritual spell that summons the ghost of a dead person. Hermetic magic is somewhat limited in its ability to summon ghosts due to the limits of magic.
Frequently-Asked Questions
Q: Is Incantation of Summoning the Dead really supposed to be a ritual?
A: According to the Line Editor, yes. Summoning ghosts is a big deal. This is discussed in further detail on the official discussion forum.
The Rego Mentem spell guidelines don't mention that summoning a ghost has to be a ritual, but the spell description does. Now that we have clarification from the person who wrote the rules, we should conclude that the spell guidelines, not the spell description, are in error. Summoning a ghost should always be a ritual.