We have boosted towers and troops how about boosted Spells?
I think spells are already strong enough. If you want stronger version of them, forge them.
Yeah as Dena said the Forge system for Spells can be considered already a sneaky alternative of “Elite Spells”
There is really not much that can be improved on the game in terms of new things.
The only big outstanding feature (in my opinion) is to do something about the defence system (as was suggested by many discussions on the forum)
Timeline of where defences fail
Saving/loading of different defence setups