Reyna Stonebranch

Reyna Stonebranch is a dwarf herbalism trainer located in the shop Ironforge Physician, in the southern section of the Great Forge in Ironforge.

Following the instructions from the tablet from Ulduar, Reyna created the liquid that was intended for Magni to communicate with Azeroth, but instead he was turned into diamond.

Quotes
I can instruct you in herbalism. Interested?
 * Gossip