Try out each of Dertrok's wands on an Arakkoa Ogre Slave, then return to Dertrok. Each wand will require an Infused Vekh'nir Crystal to use.
1x Test the first wand
1x Test the second wand
1x Test the third wand
1x Test the fourth wand
I've fashioned four wands that I believe will enhance the power of the arakkoa's crystals. Take these wands to Trogma's Claim, and try them on the ogre slaves.
You'll need to find an infused crystal off of the arakkoa in the area.
When you figure out which is best, come back to me.