Within any mode, add a boss with Healing Rain or Voodoo. This makes the player have to target this boss above the rest of the units / bosses due to the fact these AOE spells can become overwhelmingly powerful for supporting troops.
Possible include mana wells for Wizards and any other included magic casting unit, a build-able support tower that rejuvenates mana for all troops.
Possibly remove doctors and include health wells to support all non-mechanical units up on front line.
Add poison to the critical-strike assassin towers, therefore maybe add some advantage for them not just critical strike.
Add a savior unit, one that would obviously cost a lot of lumber / gold to summon for a short period of time.
Note: make sure it banishes whenever Trojan appears nearby on a large radius and can only use once
Add a demolisher attackers unit, allowing it to fire from long distances at towers with minor AOE splash damage.
And as a offence tower, the gravity tower should reach it from its distance.
Edited by CrucialOutcast, 01 May 2012 - 06:40 AM.