I thought its cool that heroes gain abilities as they level up, but what about MORE abilities? I propose this idea:
At level 20: Ability to set their favorite Target (Resources, all, defenses, or walls)
Level 25: They can deal double damage to those favorite targets (except all, plus 10x damage to walls if selected)
At level 30: They gain ability to set favorite target to Town Hall
At level 30: They also gain individual abilities that are also set: Replace barbarians sword with a pike that can target minions and dragons, but he only deals 75% as much damage. Archer Queen can do what a normal X-bow can do: all targets at a range of twice of a normal archer, or ground troops at 4 times a normal archer.
Well I like the premise but some of your powers would seriously unbalance the game and pose some serious coding problems
I would instead suggest that heroes gain a defensive power at lvl 10 which upgrades just like the attack powers these defensive powers could be anything from lessening their trigger radius to summoning units.
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I think certain upgrades for heroes should have themes, such as level 10 having a fire theme in which he can toss a bit of flame to deal damage over time, or a certain strategy use for the heroes, such as a level 41, made to fight with "ease", such as high stats. Ever think about Iron Man using his Hulkbuster suit for taking down big guys? This is what I mean. Certain levels made to fight with certain uses.
Another idea
