The Frost Gate was built by the Deldrimor Dwarves as a way to protect their homes from invaders coming through Borlis Pass. When civil war broke out, the gate fell into the hands of the Stone Summit, a xenophobic group of Dwarven renegades who are trying to overthrow King Jalis Ironhammer. Now, no one gets through the pass unless the Summit allows it.
Prophecies characters will reach this outpost by completing the Borlis Pass mission or by traveling southeast from Ice Tooth Cave through Anvil Rock.
Foreign characters, after reaching Beacon's Perch, can continue on through Deldrimor Bowl and then across Anvil Rock to reach this outpost.