A large gothic mega fortress built ...

A large gothic mega fortress built on a jagged black stone coastline surrounded by rough ocean waves. The entire structure should look ancient, towering, and heavily vertical with dozens of tall spires, needle-like towers, and pointed arches. The castle sits on a massive elevated foundation of cracked dark stone, with wide staircases and layered terraces carved directly into the cliff. All architecture should feel sharp, skeletal, and monolithic. The build must feature huge arched entrances at the lower level, some partially submerged by the rising tide. Multiple waterfalls of glowing green energy pour from windows, cracks, and drainage channels, creating streams that flow down the stone into the sea. This green glow should be a dominant visual element, lighting windows, doorways, and inte