This article is from the Spell/Hex FAQ, by cat cat@luckymojo.com with numerous contributions by others.
Animal sacrifice is more common in certain religions
than it is in magical rites in general, considered
world-wide. Very few folk-magic spells require animal
sacrifice because they derive from rural-agricultural
traditions in which animals are too valuable to butcher
indiscriminately. Religions are more likely to require
the sacrifice of an animal, possibly because the
priestly class traditionally claims the carcass as a
sort of fee or payment for services rendered.
 
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