[Legendary League]

I would suggest trying to field net 0 encumbrance thugs, like a kitted out Ancestor Smith with the right equipment and the selfbuffs it can cast. As LA T'ien C'hi, you have alot of access to anti-undead spells like Solar Rays, Cleansing Water, Blade Wind, and communion'd banishments (less effective against shielded chaff), and Earthquake (would definitely recommend this if you're dealing with large armies of chaff). Ermor's power lies in their army of chaff, and some of their major battle magics (Darkness, etc.) are difficult to deal with combined with their army buffs (Power and Protection of the Sepulchre, the latter is defensive and MR negates easily, so it's not as bad as the former, while the former is a considerable Attack Skill and Movement buff), and grotesquely large numbers. Best way to beat them is with power battle magics of your own, blessed or elite units designed to defeat them (normally with a high enough Earth bless to keep them 0 fatigue), or thugs and SCs designed to counter Ermor.