Has anyone ever thought that FR(4, what ever cool name insert here that hopefully will exist) should have a mechanic called Hero Towers.
Just like Hero Spells, Hero Towers can be used on a certain type of Tower(example: Eridan's Hero Tower will affect Archer type towers) and turns them into some sort of super buffed tower. But it only works on tier 4 towers.
Just to give a clearer idea, I'm going to use my favorite hero from Origins, Phoenix(obviously).
Phoenix's Hero Tower will interestingly affect Artillery(if the bird can lay explosive eggs, why not?). It turns the Artillery Tower into a burning tree that fires constant fireballs at enemies within radius that have an AoE effects(Ah... Phoenix's AoE).
It could really change the tide of a game, like imagine your Meteor/Lighting is not available and you have this large swarm Reinforcements can't handle and your Towers can deal enough damage to kill them. And you are on Iron or just low health. A Hero Tower(with the right hero) on the right tower might obliterate that swarm in seconds, hopefully.
What do you think, personally its a cool concept, not sure if will play out well but hey, maybe