BattleForge uses a unique game mechanic called Void Power. It is very important that you understand the Void Power mechanic if you wish to play PvP. Basically for every unit or building that dies or spell that you cast, 90% of the power you spent on it goes into your Void Pool. This Void Pools slowly feeds power back into your actual Power Pool where it can be used again. The more power in the Void Pool, the faster it feeds back into the Power Pool. So, losing a unit in BattleForge isn't really a disadvantage, you will shortly get the power back to use again. The only exception is Orbs and Power Wells. Neither gives you a Void Power refund when they are destroyed. So protect them at all costs. If you lose one, it is a permanent power disadvantage and could potentially lose you the match.