College/1.03

Dwarf
It's tier 4 when things get really interesting for the Dwarves, and it's all because of the College. This surprisingly small building (especially considering its hit points) produces arguably the best Dwarven unit, the Runelord, as well as researching three fantastic skills that is what makes fighting the Dwarves so annoying late game. Needless to say, Colleges should take high priority for building when they become available, and should even consider rushing through a lower tier to get to them. As the lone unit it produces is a spellcaster, you should also consider setting the College's attitude to "Magic Defender" to have the units produced set up to auto-cast their Doomstones spell without out the need for any micro-management.

However, the construction of the College heralds the time of stone depletion. Not only do each College require 200 stone for construction, but each research and the Runelords produced require a large amount of stone, too. Indirectly, by making buildings quicker to build, it also makes spending stone quicker as well.