I have just started multiboxing myself and I decided to go with a palli/4 priests.

I am hoping that the healing from vampiric embrace will be enough to keep him healed. If not I can always pop out and heal him manually with one of the priests, but it would be tough to micro manage. I will also have vamperic touch to give us enough mana to keep going through the long fights (and they will be long since 4 shadow priests aren't going to be the best dps).

Problem is going to be the agro the shadow priests will generate, they might have to slow down their healing/dmg, but if they slow down then the pallie may not have enough healing.

Still won't know till I try it, im only up to lvl 19 right now. I started going through rfc middle teens and while it was possible, it was pretty tough. I relied on renews exclusivly for healing and against 2 mobs it was enough, with 3 it was pretty boreder-line, the renews either were or wasin't enough healing. Against 4 mobs it was not enough healing, but between the renews and shielding and the ability to take out a mob real fast, it was doable.

I would start the fight be throwing renews on my pallie then run in (since he does not currently have any kind of range attack) so they all attack him first. Once they start attacking him he starts generating agro because of his aura which does dmg against those who hit him. Once he had the others he wouldint lose agro to the renew healing he had on him the whole time. Then I would focus fire one at a time till they were dead. Wands can do an amazing amount of dmg when there are 4 of them going at once.

I can't wait to get vamperic embrace because then I can truly start to see how well this is going to work, but it really comes down to not having any crowd control (maybe mindcontrol?). I am hoping dots/vamperic embrace on each mob that is attacking the pallie will be enough healing to keep him up. If he starts to run low on health I can throw a mind blast in but I am thinking shadow word: pain/mind flay/vamperic touch will be my three most used shadow priest spells while in instances.

I would copy characters into the public test realm but they have not been availble since I started multiboxing, would be an awesome way to try out different combinations of characters.