Spiked Crest

Acquisition
Drop research is ongoing, and can be found here.
 * Prophecies
 * Kryta
 * Grand Drake
 * Lightning Drake
 * Nightfall
 * Floodplain of Mahnkelon (during Drakes on the Plain)
 * Grand Drake
 * Lightning Drake

Sanctum Cay
Farm the Lightning Drakes on the beach in the early area of this mission (where the Restless Spirit can be found). There are 7-9 drakes which can easily be handled solo. Since they do not inflict a great deal of damage, a single self-heal should be sufficient. Typically, you will find 0-3 crests per run.