Fort Zennian was an important defensive keep during the later stages of the 200 Years War. Full of secret passages and siege weapons, it provided a tactically superior staging ground for large-scale conflicts. Lord Darian was dispatched to Zennian to reclaim it after it fell into the hands of the enemy, and he was given the land as a reward by the Empire. However, Darian was corrupted by evil in but a few years after the War.
In the dark mirror world, members of the Seven defended the stronghold (a bastion of hope for that world's weary humanoids) from all manner of foes including an army of orcs, giants, and dragons.