To be repaired for a small price and upgraded for a big price.
Maybe secret code to claim it? or anyone can claim a broken tower with a command?
EDIT1:
broken towers ontop of fortress walls as suggestion for placement.(invulnerable to make ai possible to ignore invulnerable towers?)
EDIT2:
by making the broken towers unique the less used bases could be made more valueable.
Edited by Kyotouryuu, 06 March 2013 - 06:08 AM.