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If you cast the entangle spell on an area that includes both a shore and some water, it's already pretty clear that those on the shore in the AoE need to make a save. What about those swimming in the water? Initially I thought that they'd need a save only if they were close to the "ground" underwater. Would the spell manifest seaweed and other plants to entangle people that weren't close though, even at the surface of the water 20 ft. above the ground?
The radius is fairly large, I'm just wondering if the plants need to come out of something or if they can manifest in relative space (water space, but still kind of empty none-the-less).
"This spell causes tall grass, weeds, and other plants to wrap around
creatures in the area of effect or those that enter the area."
I think most people play it that the spell doesn't create these plants and that the spell only works if they're already there. In that case, it's just a question of whether there's enough seaweed to entangle someone.
Some sea plants are actually grasses. Also, sea weed does have "weed" in the name. /more pedantics