Mythic changes
All bosses use Shock Grenades on random raid members. Three people will get the debuf, and after five seconds everybody within 8 yards will take damage and be stunned for 3 seconds. Simply run out of the raid into safe location (minding knockbacks).
Shock Grenades can and often will overlap with the melee adds charging people. We could have somebody standing farthest away to lure those, but it seems like most guilds just have some healer set to spam people who are stunned in case they get targeted by the charging adds.
Screaming Shrike is a low health (26M) flying add that spawn between regular add spawns, first set is two and then one every ten seconds with break again when next normal adds come. They try to do a 10 second channel on the player-controlled pod to eject the player from it. Pods have third button called Defensive Countermeasures that can kill the add instantly, but the cooldown of that button is longer than the spawn rate of the mobs so it shouldn’t be relied on. Ranged DPS need to switch and nuke these down asap.
Third boss is mostly about attrition. In practice there’s very little difference from heroic.
Here’s Method’s kill video to see what’s happening