Hydaelyn

The Heart of Sabik is a powerful piece of auracite, said to be the remnants of a long-lost civilization's attempt to harness the ultimate spell, Ultima. Though the Allagan Empire could not fully unlock its potential, they used it as the core of their devastating mech, the Ultima Weapon, which could unleash catastrophic destruction. It was granted to the Allagans by the ascian Lahabrea, however it may have a connection to the ancient being known as Ultima.