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It's ambiguous, which means it's up to the DM. Both replacement effects occur "When you cast a spell" with some certain condition. However, when you cast a spell that (requires you to make an att...
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#1: Initial revision
# It's ambiguous, which means it's up to the DM. Both replacement effects occur "When you cast a spell" with some certain condition. However, when you cast a spell that (requires you to make an attack roll) & (that has a range of 5 feet or greater), it doesn't matter what order they double in. ---- **Also of Note** If your DM uses the Simultaneous Effects(†) optional rule from Xanathar's Guide to Everything you decide what order they occur in as long as it's your turn. > |(†) Simultaneous Effects | > |- | > | Most effects in the game happen in succession, following an order set by the rules or the DM. In rare cases, effects can happen at the same time, especially at the start or end of a creature's turn. If two or more things happen at the same time on a character or monster's turn, the person at the game table-whether player or DM-who controls that creature decides the order in which those things happen. For example, if two effects occur at the end of a player character's turn, the player decides which of the two effects happens first. `from page 77 of Xanathar's Guide to Everything`|