Kotan

Kotan is a warrior that can shift into a Nether state (similar to an Aetheri) and use this power to seek out 2nd stage Aetheri that are invisible to conventional technology. Kotan are trained to notice difference in an environment and are equipped with special gear that enables them to spot and track Aetheri on the battle field.

Name
The Kotan is a short name for "Knowledge of Truth" referring to their ability to seek out hidden entities and hidden places.