For example, the fire lord shoots fireballs randomly at things inside your base. The mountain giant throws rocks at things inside your base. This is nice, however it is only a slight nuisance as it stands because they are weak.
All of the bosses should have a way of getting either to the walls, or still attacking when a player leaves a weak unit alive to block the front, such as more special attacks/abilities. Pretty much I feel no difference between fending off regular mobs to bosses because they do not pose any exponential large threat. The only threat is getting too many mobs to fit in and attack the same wall, boss or not.
Edited by enphoria, 03 March 2013 - 02:49 PM.