If two or more things happen at the same time on a turn, the person at the game table—player or DM whose turn it is decides the order in which those things happen. For example, if two effects occur at the start of a player character's turn, the player decides which of the effects happens first.
{
"name": "Simultaneous Effects",
"page": 374,
"srd52": true,
"__prop": "variantrule",
"source": "XPHB",
"entries": [
"If two or more things happen at the same time on a turn, the person at the game table—player or DM whose turn it is decides the order in which those things happen. For example, if two effects occur at the start of a {@variantrule Player Character|XPHB|player character's} turn, the player decides which of the effects happens first."
],
"ruleType": "C",
"basicRules2024": true
}