Get a [Jade]. They hide in many different places. They are rare, but if you speak with a blacksmith or engineer they might have one or two to spare.

Get a [Bolt Charged Bramble]. To get one of those, gather 10 [Witherbark Totem Sticks] from the Witherbark Trolls of the Arathi Highlands. Bring the sticks to the Circle of Outer Binding, a circle of stones in those same highlands. Place the sticks on the center stone in the circle and wait for lightning to strike it. When it does, the [Bolt Charged Bramble] will be formed.