Singing ice

Ibani VI is a large ice planet. At a distance of 31 AU, Ibani's sun is so weak that even high noon looks like dusk, and stars remain visible on the celestial dome throughout the day. The sun is not able to warm anything on this world, and it is covered by an ice layer many kilometers thick.

Ibani VI has no less than 22 moons. Some of these moons are quite massive, the size of small planets. The large amount of moons means that there are no tides, the moons usually pull all in different directions, averaging out whatever tidal effect there would be. But from time to time there are lunar alignments. Especially if several of the larger moons align, this does cause a powerful transient tidal force on Ibani VI.

There's no free flowing water, Ibani VI is covered in ice. But the immense tidal forces during an alignment event create a strong tension in the ice, ultimately making it crack. As the cracks and fissures move at high speeds through the ice mass, they create strong vibrations resulting in otherworldly sounds, heard over hundreds of kilometers. The ice sings. The colder, the louder the eerie sounds. If a crack occurs close to you, even if it is hundreds of meters below the surface, the force of the vibrations can knock you down. During a tidal event, the proliferating cracks that slowly move around the planet create a powerful and enchanting symphony unlike anything you ever heard.

This is often accompanied by weak, almost auroral light - but rather than an aurora above, the sheets of light are below the ice. This blueish glow under the ice travels at great speed, spreading underfoot from horizon to horizon in a matter of seconds, racing along like the cracks. It's not yet fully understood what causes these curtains of diffuse subsurface light, although often it is attributed to piezo-electric effects in the ice. This glow adds to the magic of the phenomenon.

The singing ice of Ibani VI draws tourists, even from Amarr itself. It's apparently the only thing for which people bother to visit this system. Well, there's the Order of St. Tetrimon's fortress, but that one is not very popular.