A Wave refers to the group of Reinforcements that spawn units from the Portals on the map. Both teams begin with the Portals nearest to their respective bases. Every 30 seconds a 'wave' of 5 Soldiers will spawn and start to run towards the enemy base, attacking enemy Reinforcements, Towers and Demigods along the way. Starting at War Rank 2, 2 Archers are added to the Reinforcement waves. Additional types of Reinforcements can be added to this wave by purchasing the upgrades from the team's Citadel. These include Priests, Angels. Catapultasaurus, and finally Giants.