From D&D Wiki
All spells with the "Devil Lore" descriptor have the following effect when cast:
All active Devil Lore spells on the caster have their duration extended by one round during a round in which a Devil Lore spell is cast. They cannot be extended by more than one round each round in this way.
Pages in category "Devil Lore"
The following 11 pages are in this category, out of 11 total.