0 0 0Spoilers ahead.*** Spoiler - click to reveal ***To permanently defeat one of the chosen you must first complete a faction's "hunt the "chosen" covert ops chain to unlock their stronghold. Eventually you will reach a large arena style tileset. The chosen will appear as will a large monolith called a sarcophagus. To permanently kill a chosen you must deplete their health bar AFTER destroying this sarcophagus. If you kill them before destroying the sarcophagus they will revive at a percentage of health. There are different methods to deal with each chosen but it helps immensely to exploit their listed weaknesses as much as possible since you will be dealing with a chosen, destroying their sarcophagus, and many additional spawned in enemies.