Editing Hero Wars: Serzeen (section)

===Ritual Magic===
You can cast your spells as rituals (13th Age, page 192). Unlike most other ritual casters, your rituals generally require you to eat something living. In troll society, trollkin suffice, but while adventuring with surface folk you’ll probably make do with animals.

Your rituals work best underground or at night. Outdoors and under the sunlight, you’re probably just wasting your time and a spell.