This does not prevent damage status effects from ticking, though. Similarly, Frozen, Stunned, and similar disabling status effects can prevent an Alien Ruler from activating based on player actions, but each attempted activation reduces their duration.Significant damage can be inflicted in only a single turn by applying such a status effect at the beginning of the player's turn resulting in the Alien Ruler taking repeated burn/acid burn damage as it responds to each action done by the player's units however, avoid inflicting them with Chryssalid poison as if they die from it they will NOT leave a corpse. The Burn and Acid Burn status effects are very effective against Alien Rulers the duration is calculated by game phases (XCOM turn/Alien turn) but damage is dealt every time the unit performs an action.With the apparent exception of a base defense mission.Unlike most other loot items, Alien Ruler corpses are always recovered even when XCOM evacs from a mission.The appearance and special abilities of each armor are directly linked to the associated Alien Ruler. Each Alien Ruler killed unlocks a new autopsy research that allows the development a new armor.If they escape, the player may encounter them on another mission, with the same amount of HP and Armor they had when they escaped.They will try to escape via a psionic rift after a few turns or if they take too much damage.Neutral actions like reloading will not trigger a Ruler Reaction. Rulers will also only make a Ruler Reaction move after an XCOM soldier within their sight moves or attacks. In the expansion, each Ruler will only begin appearing on missions after they have first been encountered during an assault on an Avatar Project facility. In XCOM 2: War of the Chosen, the Rulers' behaviors were altered to make them more manageable to deal with.They can perform one action after every action by one of the player's units.Strong powers and abilities derived from the basic enemy they evolved from.A huge amount of health compared to the stage of the game that the player typically meets them.The next ruler typically won't appear until the previous one is killed or successfully escaped.
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The first to appear is the Viper King, then the Berserker Queen and the last is the Archon King. The player cannot encounter multiple rulers in the same mission. The three Alien Rulers introduced in the DLC are: the Viper King, the Berserker Queen and the Archon King. Alien Rulers are new enemies added to XCOM 2 through the Alien Hunters DLC.