Void Power is a pool of Power that comes from any used spells, destroyed buildings and killed units. Also, toggle abilities add up to the Void Power. It is used to rebalance and quicken up the game as well as it creates the need of some Power management. ALWAYS pay attention to what you think your opponents Void Power might be. There are certain spells that interact with Void Power, but that is not so important now. Some math - 90% of used Power for a spawned unit, used spell or a built building will be refunded when the unit is killed, spell is issued or building is destroyed. 100% of toggle abilities is returned to Void Power (VP from now on). The more VP in the pool, the faster it flows into Usable Power (UP). The approximate rate is 1 Power into UP per 50 Power in VP pool every 2 seconds - example - if I have 0 VP and my Harvester dies, my VP pool will now have 300-10%(300) = 270. In the first two seconds, I will get back 5 Power, as it is closer to 250 rather than 300. If you wish to know more, I highly reccomend reading the official BF Wiki page HERE. Also, here is a flowchart from that Wiki page and percentage of all actions to help out. Good luck Skylord! ActionAmount transferred to VPAmount transferred to LPUnit dies (D)90%10%Building is destroyed (D)90%10%Power Well is destroyed (D)0%100%Orb is destroyed (D)0%100%Spell card is played (E)90%10%Activated ability is used (E)90%10%Toggled ability is used (E)100%0%Building is repaired (E)100%0%