The Biliskner was Thor's Asgard mothership. Enormous and powerful, Asgard motherships were legendary among the Jaffa. They were powered by four neutrino ion generators and were equipped with powerful defensive shields, transport beam technology, communication systems which included holographic projection, medical systems including stasis pods, as well as a sophisticated cloaking device that enabled them to avoid detection by satellites and telescopes when in orbit around Earth.
When the Biliskner became infested by Replicators and directed toward Earth, SG-1 assisted Thor by using an explosive device enhanced with elementary naquadah to destroy the deceleration drive, deliberately causing the ship to accelerate out of control and burn up in Earth's atmosphere. The Biliskner crashed into the Pacific Ocean about 400 miles off the coast of California, and the impact was explained as a meteor strike. Newer Asgard motherships designed to replace the Biliskner included the O'Neill and the Daniel Jackson.