It's definitely possible! Inside the seaweed is...not much. Uvi are essentially animals with a more humanoid form, so they exist within the seaweed with few items and food. Not a lot to see except more and more Uvi. The seaweed mass is comparable in size to the Aimintas city itself, so it's not like you can blast a tidal wave right through it unless you have a LOT of powerful water magic -- but maybe y'all can scrounge some up!
Coating them with ice is also a really good proposal and may work better than the water alternative. The Uvi can utilize some water magic, but ice isn't in their wheelhouse. It would indeed trap them inside if you could somehow coat it in ice. The Uvi do have tools that could eventually break through the ice, but it would take a while. (If you do go with the ice thing, drop a line here so the OOC post can be adjusted accordingly.
Uvi CAN be trapped, but they will die after the 10th comes around since they only have so much time for utilizing oxygen.
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Coating them with ice is also a really good proposal and may work better than the water alternative. The Uvi can utilize some water magic, but ice isn't in their wheelhouse. It would indeed trap them inside if you could somehow coat it in ice. The Uvi do have tools that could eventually break through the ice, but it would take a while. (If you do go with the ice thing, drop a line here so the OOC post can be adjusted accordingly.
Uvi CAN be trapped, but they will die after the 10th comes around since they only have so much time for utilizing oxygen.