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<blockquote data-quote="toucanbuzz" data-source="post: 7912686" data-attributes="member: 19270">I ran into this issue past session. I made a call then looked it up. My holding was the same as the <a href="https://twitter.com/jeremyecrawford/status/816440444162715648" target="_blank">Jeremy Crawford tweet</a> answering how to adjudicate, based on the rules as a whole:You can cast underwater, but if you're casting, you're not holding your breath (the per minute rules). You're now in the per seconds rules (Con modifier) where you have no air in your lungs.I'd also rule that you can't cast once you're in the &quot;no air in your lungs&quot; part, though in my scenario (spoiler for anyone who plans on playing Tamoachan): [spoiler] The party was surprised. They met a nereid who tricked them into thinking they could only get through a door by answering her riddle, which I made super simple (the classic &quot;river&quot; riddle, runs but cannot walk...) She then parted the waters of her pool to let them by (making a path to the wall they could climb to the door, hiding the actual path along the wall). Once they were in the waters, she sent them crashing down. I had everyone make a d20 roll against my d20 roll to see if they managed to take a breath. Everyone failed (I rolled a 17) and a water creature attacked. My casters wanted to cast, and I generously ruled they had just enough air to get out one spell (in effect, I added 1 round to the Con modifier rule).[/spoiler]EDIT (Summary): If you held your breath (air in), you can get 1 verbal spell out. After that, you're out of air (air out), likely close to drowning, and can't cast anymore.</blockquote>

[QUOTE="toucanbuzz, post: 7912686, member: 19270"] I ran into this issue past session. I made a call then looked it up. My holding was the same as the [URL='https://twitter.com/jeremyecrawford/status/816440444162715648']Jeremy Crawford tweet[/URL] answering how to adjudicate, based on the rules as a whole: [B]You can cast underwater, [/B]but if you're casting, you're not holding your breath (the per minute rules). You're now in the per seconds rules (Con modifier) where you have no air in your lungs. I'd also rule that you can't cast once you're in the "no air in your lungs" part, though in my scenario (spoiler for anyone who plans on playing Tamoachan): [spoiler] The party was surprised. They met a nereid who tricked them into thinking they could only get through a door by answering her riddle, which I made super simple (the classic "river" riddle, runs but cannot walk...) She then parted the waters of her pool to let them by (making a path to the wall they could climb to the door, hiding the actual path along the wall). Once they were in the waters, she sent them crashing down. I had everyone make a d20 roll against my d20 roll to see if they managed to take a breath. Everyone failed (I rolled a 17) and a water creature attacked. My casters wanted to cast, and I generously ruled they had just enough air to get out one spell (in effect, I added 1 round to the Con modifier rule).[/spoiler] [B]EDIT (Summary): [/B]If you held your breath (air in), you can get 1 verbal spell out. After that, you're out of air (air out), likely close to drowning, and can't cast anymore. [/QUOTE]

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