Vyemm and Alzid Prime can still be seperated, but its much more difficult than previous versions. See Alzid Strategy.

His frontal cone Energy Vortex is the biggest threat for killing your raid.

The Scream of Chaos (SoC) is survivable by everyone if you have enough mit for it to do 3-4k dmg. You should have plenty of time to group heal up before the next one goes off.

To make life easier, aim for 10k+ raid dps.

When battle rezzing, if its near a SoC - make sure to wait until after the AE before hitting 'accept', otherwise you'll get up and get spanked again.

Vyemm does do a toss-up with your raid, best to tank this big guy where you wont stay in the air for long but can still get easily behind the mobs rear legs.