Improving the walls of dark elixir

[FLORIAN]

I'd love to be able to improve the wall fence of the black elixir. I now have a complete repository of black elixir and I absolutely nowhere to put it (lab and characters maximum). For example fence level 10 would cost 30,000 black elixir.

[UndeadZombie]

Something tells be you haven't unlocked dark elixir and don't know how precious it is.