Dark elixir spells and troops.
Such spells could be ones such as necromancy which would last 1 second and were ether it fell normal skeletons like the witches would rise out of the ground. Smog maybe it covers your troops from any enemy defensive building apart from from traps as they sense and don't see, a disadvantage is you cannot see your own troops so it doesn't become OP. Maybe for the dark version of the wall breaker a troop that senses traps and de activates them. ice spells May damage inferno towers. I also believe that maybe your "help" for the Valkyrie didn't really help it it is still considered the worst troop in the game maybe make its training cost 60 and make it 10-12minuets to train or lower its housing space. also for clan wars maybe you can team up to attack other clans plus you could have sub clans so if a clan with more trophies sends a request to the clan leader to ask if the clan could be a sub clan this deal can always be destroyed by if the leader says so or the sub clan becomes better than the "master clan". also you could put a little gem next to someone's name to shown that they have bought gems this will stop a lot of arguments like at school if someone upgrade and there is a massive fight over that in particular person being a gemmer.