Gallery/1.03

Dark Elf
Galleries are small and cheap, research only three upgrades, produces no units nor is it required for the production of units else where. As such, you'll only ever need one of these and even if it gets knocked down, as long as you've obtained the researches from it, then you wont even need to rebuild it. This makes them ideal to be pushed into the corner of your base that's somewhere out of the way.