Good Gates of Andaron players will attempt to get you to blow your Silence early, since it is on a cool-down. Try not to fall for that!
Another key spell to use is Vampiric Embrace. It heals for a good amount, especially when you have a few goa gold sources of damage ticking on the target. When combined with Shadow-form and some good armour (plus Inner Fire), a shadow priest can be extremely difficult to bring down.
Most of all don’t be afraid to drop out of Shadow-form to heal your team when they need it. If you take damage and you are on your own, bandage up, but if you are supporting the flag runner, for example, don’t stay in Shadow-form. Getting number one on killing blows means nothing if your teams lose 3 caps to nil.
Support Priest: A support-focused priest will be more effective and can definitely be more annoying in the long run that a DpS priest. The other team will immediately target you on every skirmish (for good reason), and you see results from playing this role.
The key to playing a good support priest is to find you a good team-mate. The best choice for heavy-holy priests (with a smattering of Discipline) is a warrior, because they can deal out huge damage and will often be focused on by the enemy.
Renew - This is a heal-over-time spell that does about 10, 000 healing points to targets per second. Dispel, purge, and steal this spell from the target.
Lair Brute - The brutes have a little less than 300,000 Gates of Andaron Gold hit points. Lair Brutes like backup! They call for help when they are near death so the raid needs to adjust pulls so that they are far enough away from other mobs to avoid other mobs joining the fight before the raid is ready for them.
Charge - Brutes charge players at random and dump their current aggro targets. Each charge does 700 damage points. Players that are standing too far away from brutes are charged.
Cleave - Brutes cleave for anywhere between 5,000 to 7,000 damage points, depending on the type of armor the player is wearing. The cleave arc is about 180 degrees in front of the brutes.
