[This guide](http://dulfyforce.wordpress.com/2012/01/07/guide-advanced-magenta-crystal/) seems to provide a fairly straightforward walkthrough (if a total pain to actually *do*).

1. Obtain [magenta crystal schematic](http://www.torhead.com/search/Schematic%3A%20Advanced%20Magenta%20) from a world boss
 * Belsavis boss drops +33 crit
 * Hoth boss drops +33 endurance 
 * (maybe...all bosses might have a chance to randomly drop  one of the three)
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2. Obtain the materials.  Most are easy (you get them from Crew Skills) except for the [Magenta Adgean Crystal](http://www.torhead.com/item/1nCI3EW/magenta-adegan-crystal)

3. Get the "Refreshed and Sustained" buff from a "water thingy" in the Jundland area of Tatooine (north of Mos Anek) at about (470, -2047)

4. Go to Hoth, climb a mountain at (-993, 148) until you get a debuff ("Extreme Altitude") and the item Pure Shockfrozen Water in your inventory

5. Head to Ilum, and around (-548, 36) there should be an item called "Depleted White Adgean Crystal".  Clicking it will spawn a Force Ghost, a level 50 champion with 215 kHP who drops the magenta crystal.  If you fail, you can reattempt so long as you still have the water.