A partially sunken ocean temple are...

A partially sunken ocean temple arena, 40x40 footprint, 22 blocks tall. Exterior: prismarine bricks and dark prismarine, sea lanterns as bioluminescent wall decorations, blue stained glass windows, wide reflecting pool surrounding the base, coral fans at the waterline, tall entrance archway with glowing conduit at apex, lower walls submerged in clear water. Interior: battle floor of prismarine tiles under 2 blocks of shallow water, sea lantern ceiling and floor edge lighting, raised dry gym leader platform of dark prismarine, blue ice geometric wall accents, kelp in glass-enclosed wall columns. Style: ancient underwater temple, cosmic ocean depth. Blocks: prismarine, dark prismarine, sea lanterns, blue stained glass, blue ice, cyan terracotta, conduit.