Vaelrith's Crush of the Ice Depths

You invoke the crushing pressure of the frozen ocean, large ice tentacles irrupt from the ground around a target within range. The target must make a Constitution save, on a failure they take 8d10cold damage and restrained as the tentacles crush them. On a success they take half damage and are not restrained but movement is halved until end of their next turn. While restrained they take 4d10 cold damage and they can repeat the save at the end of there turn.