User blog comment:FairyTailFan/Juvia not as strong/@comment-3075024-20130606052323/@comment-7418318-20130606065641

But that would mean they have to create ice spikes and coat them with a poison that has a lower melting point than water, rather than just freezing poisoned water.

Or create a shell of ice with the poison inside.

Both sound a bit too delicate to me to be used in a battle, though they'd make nice assasination techniques.