new currency for to buy and upgrade deffences

i think it would be a good idea to add a extra currency for gold called light gold or silver like dark elixar and elixar so you could have a different type of gold for different types of deffences and upgrades and it could be used for upgrades on regular deffences but cheaper than gold for example 200,000 gold, 100,000 light gold or 100,000 silver for an upgrade on cannons

I dont think we need another currency in the game right now. Collecting 3 different resources is hard enough already and adding another one will make it even harder.

Being able to use flexible resources on upgrade would discourage attacking harder, so I don't see this happening.