i've just played this 2 days and getting too addicted,lol.
i got idea for a new tower
-*power transmit* transmit (spread or whatever it called) the effect of any items it equipped to allies in range of 2
-*maintenance* this transmitter need maintenance fee,300/item and need to be paid every 5/10 wave.If there's not enough gold to pay,the transmitter will shut down itself. (cost will increase 10gold per level)