This drawing Alliance in Darnassus to find Myslindil to buy, the Horde in the Dark City to find Daniel Bartlett to buy, to the Alliance as an example, the method is as follows:

1, first of all, the player needs to come to the main city of Darnassus.

2, come to the location of the following picture in the craftsman area.

3, find the NPC Myslindil.

4. Conversation will allow you to purchase the formula: Enchanted Shield - Strong Endurance.