Enoch's Mirror

Long ago during the first half of the second era, there was a great wizard known as Enoch the Wise. Most records have been lost, however it is known that Enoch was considered among the most powerful wizards of his time and is known throughout the multiverse mainly due to his battling against extra-dimensional aberrations, in service to the gods.
Up until this point, besides the gods, most were not aware of the existence of extra-dimensional worlds or the threats therein. Deeply troubled by this, as a reward for his service, Enoch asked the the gods to give him the ability to detect threats from other realities. The gods respected his wishes, and rewarded him a magical mirror that would only reflect the image of beings not from this timeline. This magical item is one of a kind, and is said to have driven Enoch insane with paranoia in his latter years.
Kohdama the Blind Seer rediscovered the lost artifact about 50 years ago, located in a Secluded Grotto, which eventually lead to him settling at the Bastion.