This profile farms Volatile Earth from Obsidian Stoneslaves in Twilight Highlands. Alliance Vendor/Mailbox support included. Map: Results on level 90 toon (minimal testing): 500+ kills/hr 40+ Volatile Earth/hr View attachment (A)_Twilight_Highlands_Volatile_Earth.xml
40 total per hour. The drop rate is like 13% so you could see closer to 50/60. The numbers didn't take mining the corpses into account.
