When the Dead do walk, seek water's run,
For this the Dead will always shun.
Swift river's best or broadest lake
To ward the Dead and haven make.
If water fails thee, fire's thy friend;
If neither guards, it will be thy end.

pp. 359-360. - Old Kingdom series (The Abhorsen Trilogy) - Lirael: Daughter of the Clayr (2001)