A new feature that would be cool to have could be and might require a major update 
:
Prime Tower Troops:
Like we have tower troops such as tower princess, cannoneer, baby goblins and dagger Dutchess for side towers, the prime tower troops would be the troops for the centre tower like King(Common prime tower troop) and Goblin queen(Rare prime tower troop).
Some of the suggestions for prime tower troops are:
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Skeleton General (Epic prime tower troop) : The Skeleton General, complies to the skeleton theme and uses grenade launcher gun for ranged attacks, thus being the first centre tower to deal area damage. And/or it will release skeletons as and when any troops die in the battle.
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Sorcerer Spirit Tower (Rare prime tower troop): The sorcerer spirit tower will fire magic spells to hit enemy troops with fire, ice and electro spirits to defend and shoot heal spirits, clone spirits, rage spirits to empower its own troops. Thus becoming the first tower to interact friendly as well as enemy troops.
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Super Dragon Tower (Legendary prime tower troop): The super dragon tower is the first ranged tower with area and chain damage where the super dragon shoots a stream of fire on enemy troops that causes area and chain damage but requires a recharge.
Prime Trophy Game mode:
This game mode will allow players to choose between different prime tower cards such as king tower, Goblin queen, skeleton general, sorcerer spirit and super dragon as it’s defending tower for 1vs1 or 2vs2 gameplay.
