Dark Soul Stone
Item obtained from defeating Earth Wyrm Trasken or from collecting Veridan, Kechi, and Michaela's Soul Stones. Take it to Head Priest of the Earth Daichir to be recognized for defeating Earth Wyrm Trasken.
Not dropped by monsters.
Cannot be spoiled.
The chances are official (x1). On servers with x10, x100 and higher rates, drop and spoil come more often.