Please see https://www.wowhead.com/guides/anduin-wrynn-encounter-journal-boss-abilities-raid-loot for full tactics.

• Split raid into two equal groups for cone realm hop.  Assign players to CC P2 adds (3 on normal/5 hc)

P1:

• Giant frontal cone, Kingsmourne Hungers - anyone hit goes to different realm to fight adds (alternate groups).

  • Adds: Despair - tank, nuke, drag over Doubt adds for cleave; Doubt - CC, keep from centre; Hope - heal, keep from edge.

• Blasphemy - yellow or black circle/icon.  Yellow stand to one side and black finds a yellow to stand on.  

• DON'T stand on someone of the same colour = wipe.

• Chrome arrow over your head - move out, stand still, dodge boomerang missile.  Everyone else also dodge.

• Barrier cloud (fire screen) - stands inside, healers pump out heals to remove.

• Tanks taunt swap when needed (stacking attack speed buff on the boss).

Intermission (after 2nd cone fight):

• Bloodlust.

• Nuke fallen king and cleave adds.

P2 (after 60 seconds):

• As P1, without the Blasphemy black/yellow debuffs.

• Plus "Grim Reflection" adds (twice in phase) spam cast AoE fear and big DoTs.  CC them.  Drag boss over them one at a time.

• Adds need to die before Anduin gets to full willpower.

Intermission 2:

• Same as Intermission 1, but with walls of enemies. Kite boss/adds near edge of platform to avoid.  

• Don't be near centre at end of phase.

P3: 

• Spread out.  Raiders with Hopelessness debuff (black circle) avoid others and remove in yellow pool in centre of room.

• Pool shrinks from every use, and causes a 3 second raid wide DoT.