Direct Strike 6.2.3

Heroes in your building area are a mirror of your heroes on the battlefield.\r\nWhen you learn abilities for your hero in your building area, the actual hero on the battlefield will receive those abilities. Melee heroes receive an additional 10% XP per kill.\r\n\r\nYou can only have one hero type active at a time, e.g. you cannot have two Paladins on the battlefield. Your hero will respawn when it's dead.

Income System:\r\n\r\nYou get 100 gold over 20 seconds. Building Gold Extractors increases your income.\r\nControlling the middle counts as an extra Gold Extractor.\r\n\r\n0 Gold Extractors: 100/110 gold\r\n1 Gold Extractor: 110/120 gold\r\n2 Gold Extractors: 120/130 gold\r\n3 Gold Extractors: 130/140 gold\r\n4 Gold Extractors: 140/150 gold

Units have timed life, meaning they will die if they have been alive for 130 seconds.