Arctic Temple

The Arctic Temple was a First Civilization construct located somewhere in the. By the 18th century, the ruins of the temple were largely covered in ice.

In 1760, the Arctic Temple was rediscovered by the Colonial Assassins and Templars, when the Assassins were able to locate it using the Precursor box and manuscript. Upon reaching the center structure within the temple, the Mentor Achilles Davenport and Liam O'Brien were confronted by Grand Master Haytham Kenway and Shay Cormac. Achilles stopped Liam from killing Shay for betraying the Assassins, and Liam accidentally activated the temple's defense mechanism in the struggle.

The temple triggered an earthquake, causing most of the surrounding area to be destroyed. While the Assassins and Templars made their escape from the First Civilization ruins, Liam was killed by Shay Cormac.

Reference

 * Assassin's Creed: Rogue