Cathedral/1.03

Knights
The Cathedral is the most expensive base building the Knights can build and one of the most useful, too. With production of the Knights General and a second (and more useful) advanced flier, as well as the Titan, the Cathedral will certainly be continuously producing units. It also researches some very powerful and useful skills. All this will encourage you to build a decent amount of them but that cost and somewhat large size can cause difficulties in getting them built. Although, with its high hit points and Holy Word ability, it's not entirely helpless if it comes under attack. This allows the Cathedral to stand strong even when on the out-skirts of your base. But still aim to have the most protected one build the Knights Titan.

Since the Cathedral can produce two different spell casters, it's always a good idea to set the building's attitude to a magic casting one, so the produced spell casters adopt the same attitude. This'll cut down on micro-management later on.