I think on defenses (and/or troops supercell decides) that they should also have a seperate upgrade path but with dark elixer. The dark elixer would not effect the regular upgrade path but could do more damage or have a special attack for example lets say you upgrade a cannon with dark elixer (however there's a certain lvl it has to be and in this case lvl 9)the stats are:
While it is interesting.... I believe it would be quite expensive... More like 100k de per upgrade to balance them.. Because any addition to the towers is permanent and all the dark upgrades are very powerful....
Adding more range to any tower will make them very powerful as troops can be targeted at further range....
And stun, faster speed yields more damage....
Too high and overpowered .tHis would unbalance the game. If you make a whole new defense that costs dark elixir (inferno tower, but that costs gold to build and upgrade, and 600 dark elixir is nothing,m that how much a dark air bomb is)
