Why bother letting them try? Liquid oxygen is -218 degrees Celsius to liquid nitrogen's -195.
You ever see someone use liquid nitrogen to freeze a banana and shatter it? Imagine that, but you've got bone critters soaked in lake water trying to exert themselves.
They're magic, so I don't expect it to kill all of them, but it seems like it should deal some significant upfront pain followed by drip environmental damage.
Iku will probably have some way to make himself immune, but it's still something he'll have to pay for.
Is this viable
@DragonParadox ?