Torus-
Torus took millennia to build. But the architects had time on their hands. After all, they were Eternals.
While the majority of their kind roamed the Universe in search of diversions to help them fend off the gnawing boredom of eternal life, after the first few billion years, a group known as the Yerekek, decided that they'd had enough. It was time to move on.
Banished and shunned by their people, they setup shop in a backwater system with a quartet of gas giants that circled a dying sun.
The Eternals built Torus as a doorway. Nothing more. They left it behind, forgotten, awaiting the last of their kind. But strangely none ever came.
It was the only way that an Eternal could pass on to… on to what they hoped would be Heaven. The tendrils of Torus, when carefully directed, would lick the body of an Eternal and pass the soul through the gateway. To heaven.
The Yerekek were, essentially, an Eternal suicide cult.
Torus was sentient in the sense that it possessed its own controlled energy signature, meant to dispatch each Yerek through and remain operational after the last passed through.
It had remained dormant so long that it took several months to react to the rape caused by the mining operations. By then it knew that it was too late- it would soon die. So it decided the only way to send the last of the Eternals through to the other side was to send everything in the Universe through at the same time. It would send everyone to Heaven at once- whether they liked it or not.
It spent several months gathering enough energy and analyzing the Ripwell that clung to its atmospheric skin like a vapid leech.
As it unleashed it's final, desperate surge, Torus' sentience touched a miniscule, yet stimulating morsel. The energy signature it tasted was tiny, yet direct. Coherent, unlike anything it had tasted in a billion years.
It studied the message and understood.
Torus reversed the energy swell: the wave came crashing back into its surface, plunging deep into the core, scything through every atom before sucking itself through the dimensional maw.
The planetoid remained, its huge mass rotating silently in space, but the intelligence was gone, the dimensional rift was gone.
Torus left to follow its masters into the unknown- where it would no longer be alone.