From Paragon Wiki
Combat Phasing was introduced with Issue 21, and is described in the patch notes released with that issue.
- Missions in Atlas Park and Mercy Island utilize new combat phasing technology. Players can help change the world depending on their actions; if they have a mission to defeat Hellions in an area, after that mission is complete, that area can be replaced by PPD forces.
- When a player is in a combat phase, they will only see players and entities who are also in the same phase.
- When on a team, the player who is the current task owner will be the "Active Player"; all players on the team will be put into the active player's phase. This works similar to sidekicking.
- Players who have out-leveled the Atlas and Mercy Island missions can use flashback to go back and complete the missions and change the world. Note that the world will only be changed once players have fully completed an arc.