Okay, I am in need of underwater casting in general. Where is this covered? I have found reference to Fire spells underwater needing a Spellcraft check to work so I am assuming it is possible for a mere humanoid wizard or cleric to cast underwater. Is the answer a Concentration check, with the DC 15 for violent motion? Does this assume non-aquatic humanoids can speak underwater without magical means, or is underwater casting possible only if freedom of movement, water breathing are aiding the character or the silent and still metamagic feats? Or polymorphing self into an aquatic humanoid? Your thoughts and experiences are welcomed.
I'm not sure where it's covered exactly, but I would rule that, while one can speak underwater while casting, if they have no natural or magical adaptations (aquatic subtype, water breathing, etc.), it would empty the lungs of air. You would have one round to get to the surface before starting to drown. That's just my thought, however.
I remember seeing somewhere that you could cast spells normally underwater (except for fire spells) but that without some sort of underwater breathing ability or effect you couldn't speak and thus couldn't cast spells with verbal components.
Anyone here have the AD&D complete Wizards? They had an entire section about it, complete with a list of non-castable spells.