Base Prime was a construct erected by the Qreph brothers on a monolith of unknown origin (possibly Mortis) inside the Bubble of the Lost in the Chiloon Rift. It housed the laboratories where the brothers conducted their experiments. It was destroyed in 45 ABY after Luke Skywalker, Leia Organa, Lando Calrissian, Ben Skywalker, Omad Kaeg and Tahiri Veila successfully rescued Han Solo from the Qrephs.