Lothos Riftwaker

Lothos Riftwaker is a blood elf quest giver located just outside the entrance to Grinding Quarry in Blackrock Mountain. To get to him, walk down the second chain heading towards Blackrock Depths. He is standing in a small chamber right at the entrance. Just talk to him after having completed the attunement quest at any time and to be teleported into the Molten Core. This also works while you are dead, or not in a raid.

Quests

 * Attunement to the Core

Quotes
The fabric of which our world is woven is most delicate. It merely takes some knowledge and the application of said knowledge to tear the fabric. It is thusly that rifts are born.
 * Gossip