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Ethos Gate is a barrier generator hidden beneath the Ethos Headquarters in Aquvy. It functioned in conjunction with three other gates, one in Ignas, one under the ocean at Sargasso Point and a fourth in Etrenank, the capital of Solaris. The three external gates formed a triangle around Solaris and worked together to create a barrier that phased Solaris out of synch with the rest of the world rendering it invisible to the rest of the world.
When all three external gates were destroyed Solaris phased back into synch with the world and allowed the fourth gate in Etrenank to be destroyed. The Ethos Gate was destroyed with the powerful energy cannon from Ft. Jasper was fired on Babel Tower, which used its massive mirror to redirect the beam onto the Ethos HQ.