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D&D 5.2 SRD Rules Glossary

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Ritual

Source: D&D 5.2 SRD Rules Glossary

If you have a spell prepared that has the Ritual tag, you can cast that spell as a Ritual. The Ritual version of a spell takes 10 minutes longer to cast than normal. It also doesn't expend a spell slot, which means the ritual version of a spell can't be cast at a higher level. See also "Spells."