Her name that has appeared many times in Veiled One literature. No scans or contacts have ever been made.
It is not known if any Eclipse is sapient.
They appear in our universe as an enormous black sphere, around the size of Jupiter. When one contacts a star, that star cools and becomes a white dwarf, or collapses into a stellar remnant. No supernova occurs. When it appears to physically contact planets or spaceships, it is incorporeal, but visible. It is not known if Eclipse becomes corporeal on contact with stars.
At regular intervals, Eclipse ejects large quantities of matter. This has been from a wide variety of sources, and recovered materials include vaporised organics, atomic cogs, black holes, trees, and whitemetal. These come from other Eclipses around Obeidon, and some arrive on delays.
The Eclipses have been around for millions of years. They have been recorded by civilisations, which saw their sun being occluded like in a solar cclipse, so the name.