Here is a quick guide to healing Blackrock Caverns, with a little bit of boss strategy thrown in. This is based on personal experience, so your mileage may vary.
Rom'ogg Bonecrusher: You need to clear the pat and packs close to the boss first. If you do not he will
call for help and probably kill your group. Once you engage the boss, stay at max range and heal. The boss has a few abilities you need to worry about. First is
Quake. Quake is a fairly quick cast, targeted/AOE. Near as I can tell it targets 3 ranged targets and does a fairly significant amount of damage over time. When you see it targeted run away. Second ability you need to worry about is
Chains of Woe. Chains pull you to the boss, and roots you into place. Chains need to be AOE'd down fast. Twenty seconds after casting chains he will use The
Skullcracker, 360degree cleave in a 10 yard radius that deals 100k damage. If you do not get out of it, you will die. I recommend running straight through the boss and away soon as your chains are broken. Use any cool downs you have, make sure Earth Shield and Riptide are up on the tank and kill the boss.
Once you kill the boss, a large NPC is released from a cage, when ever you see a pull that looks impossible, wait a few seconds the NPS pops out, and kills the mobs for you.
Corla, Herald of Twilight: Only allow one zealot to evolve at a time or you will wipe. You need to swap DPS in the evolution beam, or one of the players will evolve and become mind controlled and you will wipe. We found we had the DPS to kill the cultists before they evolved, but then the boss dropped no loot. I'm not sure if this is a bug or a feature. Once a zealot evolves he will cast
Shadow Strike you should interrupt it. We found it best to burn the boss till the first zealot evolves, kill the evolved Zealot then back to the boss till the second evolution. Once the second zealot is evolved you should have the boss pretty much dead.
Corla casts
Dark Command, but tremor totem and chain heal should take care of it. She also Death Grips a random player to her through the encounter. Watch the Zealots melee abilities while you are running back out. The zealots are the real boss of this encounter, once the zealots are down, it is pretty much tank-n-spank. Don't be afraid to use chain heal and riptide.
Karsh Steelbender: From a healers perspective this is a tank-n-spank fight. Watch for the cleave, and don't die. Tanking is a little more difficult. He has
Quicksilver Armor making him basically undamageable. The tank needs to drag him through the fire in the center of the room, giving him
Superheated Quicksilver Armor. Every stack increases damage against him by 5% +1000 per melee attack. But every melee attack causes an AOE splash to the group for 1000 damage over 12 seconds. Anything over 6-7 stacks becomes unhealable and the group wipes. So you have to let the stacks of superheated fall off, then drag him back through the flames.
Beauty: Optional boss, Tank-n-spank. Boss has a
fear, drop tremor totem. The only other things to look out for is the knock back ability
Flamebreak and a random charge ability
Beserker Charge. There is a lot of group damage, so chain heal liberally. One final ability is a living bomb like ability called
Magma Spit. If you cleanse it, and the target is close to other members it will blow them up. Run from the group before cleansing, or just let the timer tick down.
Ascendant Lord Obsidius: The final boss of the first Cataclysm dungeon. He has two
Shadow of Obsidius who should be off tanked or CC'ed away from the boss. These adds are pretty much immune to damage so ignore them. Obsidius will randomly swap into one of his shadows, so there is a target switch with an aggro reset.
Obsidius really doesnt have any abilities of note. A pretty basic melee ability
Stone Blow, an identical ability to Warriors,
Thunderclap and a shadow damage spell
Twilight Corruption. This fight is by far the easiest in the instance, assuming you can target switch mid-fight.
Depending on how real life runs today I will try to discover
Throne of Tides, or
Vortex Pinnacle and let you know how those are.