Shrine of the Sword/1.03

Knights
A very useful building indeed - the Shrine of the Sword offers a broad range of great researches, as well as producing decent units in the form of Dancing Swords. The building can even turn fallen units into Dancing Swords, saving both time and resources. This ability alone can influence the amount to build and where to put them. Having one by each entrance of your base to cover common battle-grounds, allows for regular raising of Dancing Swords. Having multiple Shrines of Swords also allow for quicker researching, which would otherwise take a considerable amount of time to get through them all due to the sheer amount of them and the long researching time of the lower listed ones.

The building is pretty tough and can weather any stray attackers that find themselves upon the Shrine. The Shrine's 200 crystal cost instead of any gold is also beneficial, as the Knights only start using crystal in tier 4 and are forever in demand for gold.