The Warp Gate (WG) is used to send units into battle.
The WG has 3 charges. 1 Charge is consumed for attacking a Faction (NPC) or an offline Player (PvP). 2 Charges are consumed for attacking an online player.
Charges replenish concurrently, but 30 minutes from the time they were used.
Increasing the WG level will increase the capacity of troops that can be sent into battle.