Archon (XCOM2)

The Archon appears to be an evolution of the Floater, but instead of a dedicated ranged weapon, Archons are armed with a powerful melee-ranged hybrid weapon. They can fly and have good health and dodge, making them tough to take down. In addition, if they take damage they will Battle Frenzy, giving them an extra action that will almost certainly allow them to close with you next round.

Unlike Floaters, Archons have the blazing pinions ability, they will fly to the top level of the map and release a volley of missiles wich will impact on the next round no matter if the Archon is killed or not.