NormalEverdark

Phase I

Kill all 7 valkyries before the real boss will spawn. Pretty straightforward. You won't know whether it's normal or everdark until the transition to phase II.

Spread out
Kill 1 by 1
Stance break/stagger
Glowing spear indicates the big combo

Phase II

The pink boss valkyrie spawns, resurrects all the others, and targets one player with divebombs and an explosive rain of spears. The target is shown with a red circle. Spread out and dodge until it's over, then rinse and repeat until the boss is dead.

Watch out for the grabs!
Dangerous moves are indicated by glowing spear and the boss summoning his valkyries to his position.
Don't bother focusing the boss - when you kill him, all of the others get resurrected so it's better to kill them.