Cast (PSR Supplement)
From D&D Wiki
Other Dangers Rest |
If you have a spell learned or prepared, you can use your action to Cast that spell. You can only Cast once on each of your turns, even if you cast as a bonus action, except when Casting a cantrip.
For a spell with a casting time longer than 1 action, you must use the Cast action once per turn on subsequent turns for the entire required casting time, and the spell is enacted only with the final Cast action. If this string is interrupted, the previous actions are lost without cost or effect.
Sometimes an item requires a Cast action to activate it, instead of the more common Use action.