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Dark Catapult
These pesky inferno towers can be quite a pain to counter regardless if they're single target or multitarget. I propose a catapult that launches dark elixir that burns when it hits a building for initial damage plus minor burn damage overtime which resets with every hit. It can favorite inferno towers and out range them slightly not allowing inferno towers to hit them but they are devastatingly poor on defense so to use them strategically would be crucial when it comes to other defenses.
As for art etc, I'll leave that for supercell.
This is just my idea.