My idea is that there will be a new 1x1 trap: the treasure chest! BUT, unlike normal traps, you don't want your enemies to find it! The way it works is that you put your loot into it and if someone triggers it they get all the loot inside.
Lvl 1:
Unlocked at th lvl 6
Cost: 100 000 gold
Cost to rearm: as much as you want unless you are exceeding your chest's limit
Loot limit: 100 000 gold 100 000 elixer
Chet's available: 1

Lvl 2
Unlocked at th lvl 7
Cost to upgrade: 200 000 gold
Cost to rearm as much as you want
Loot limit: 100 000 gold 100 000 elixer 1 000 dark elixer
Chest's available: 2

Their will be more stats soon!

This wil be a great idea because it is super easy to get, not like most bank ideas. Also, what if people just put all their loot into treasure chests? Then all you have to do is trigger the treasure chest to get the loot!
And if they place it outside their walls at a random location, I guarantee you their will be a new strategy where people randomly place archers trying to find your treasure chest.