Cráb People

Uve guessed it im asking for pointers, on this boss encounter os whatever we did we just cudnt take him/her/it down.

we even had 24 up 1 down, but we always run out of mana on phase 2.

he might be bugged or i might be wrong bu he had a go at ppl that were like nr 8 and 10 on omen too :/
so were quite clueless, but i hope u can gief some pointers idd.

Obvious thing to do is make sure everyone is using not only a updated version of omen but the same version of Omen.

Try kicking the spirit shocks

Kick the spiritshocks, Use 2 felhunters to devour the shield ( Or have your mages spellsteal it. ) Tho they will run out of mana faster then.
Use Curse of Tongues... Never EVER kick the deaden. and uhmmm... dps like mad but stay below the tank

Next to all suggestions made here tell your tank to reflect deaden. It should give a nice dps boost indeed, just hope your mages and locks don't 1 shot themselves.

Move the tank to melee group with enhancement shaman. Extra threat doesn't hurt

Or shadowpriests! SW:D Taznaman? :p

Summary of things said here,

1 - kick spiritshocks, this is a must, you cannot have him running around randomly to dps.
If they even survive you lost alot of dps.

2 - get rid of the shield asap, prefer mages getting it, but most important part is it gets removed fast to be able to interrupt again.

3 - reflect deadens, you can miss one, maybe, but at that gearlevel you can't affort to miss more.

If you have these basics covered, and you still run oom, start looking at your setup.
Also, you mentioned you even had 24 up 1 down, does this imply you usually have 1 or more people dead at the end of phase 1 ?

Especially on first kills you will need everyone up.