Racial ability: "Preparation".

A lot depends on the initial attack of the prism dragons. Imagine how unlucky it would be if players massed archers, and the dragons' attack, followed by the archers' double shot (something related to luck, something related to the avenger skill), instantly destroys all the archers. In reality, the probability of this is very high. However, I still believe that it is usually better for players to prepare monks into cavalry. The limit of 20 will not allow for creating enough archers, and it is practically impossible to prepare more than 20 paladins per week.