On Looking For Raid difficulty, the Archimonde encounter has largely the same mechanics as described above. However, the following changes ensure that the fight is killable in a less organised group:
$1 Shadowfel Burst will only affect its primary target, and will not launch nearby players into the air
If fewer than 7 players enter the Twisted Nether via the $1 Nether Banish ability, the game will automatically select additional players to be teleported to the Twisted Nether
Infernal Doombringers will not cast $1 Eternal Flame on LFR difficulty
Infernal Doombringers now take 45 seconds to gain full energy, rather than 30