Clash of Clans extends 1 Gem boosts to everything
Last week, SuperCell played father Christmas by lowering the cost of a 24 hour boost for your elixir collectors, barracks, and dark barracks to just one gem.
Keeping true to their word, they haven't forgotten about your other collectors. Today, the developer rolled out a new event in which you can boost anything for only one gem until January 7th. This includes gold collectors and spell factory.
Finally, I can complete my walls!