The Stonecore walkthrough

The Stonecore

Corborus

Normal: He will shoot rock shards at a random player, move away. After the shards hit they will turn into adds, aoe them down.
Every so often the boss will burrow underground, and summon more adds. Durring this phase watch the ground for moving rocks and sand. Move away if your standing in this, as he will quickly emerge and do a lot of damage to anyone standing there.

Heroic: Same thing but with a new debuf called Dampening wave, this must be dispelled as soon as possible. 1 dispel will get rid of the whole stack. On top of this he will now shoot a large crystal at a random player, move away fast or it will explode causing more adds to come and a lot of damage.

Slabhide

Simple fight in both heroic and normal, He drops aoe's and will eventually fly into the air, when in the air shadows will appear on the ground, don't stand in them. Pillars will fall and these can be used to LOS his attacks, which considering how little damage they do, is not really necessary. This guy is a chump.

Ozruk

Normal and heroic are the same.
He needs to be tanked with your back to the wall as he does a knockback.
He will get a buff called enrage, this must be dispelled as soon as possible.
Range and heals need to be at least 15 yards away from the boss to avoid his attacks, Melee are SOL for the pillar shatter attack, but when he starts channeling Ground slam, they need to run to the casters.
He will periodically cast a Elemental Bulwark, this will reflect 20% of spells cast at him back at the caster, keep attacking but make sure your healer is not overwhelmed.
He will periodically cast a Spike Shield, any melee attacks made at this point will cause the attacker to bleed for decent damage over time, if you're a tank, rely on any non melee spells you have for the duration, melee do the same but make sure you don't pass 9 stacks as you will die.

High Priestess Azil

Same in both normal and heroic, except she throws more rocks and they are a bit larger.
She will start out casting at the tank, LOS her to bring her off her pedestal. She will drop AOE's and spawn adds, when these adds are spawned they must be killed fast. At this point she will warp to the pedestal again and start throwing giant rocks at the party. Dodge them while fighting the add's.
She will periodically Force choke someone, which will lift them into the air and slam them down for a lot of damage, just keep that person healer. But watch out, I have seen the healer get gripped, if that happens anyone who can heal should do so on the healer.