This is one of 7 Crystals that can drop with a very low chance. Not sure if they're tied to locations. Each one provide a strong buff for 30 minutes.

Buffs:

Attack Speed +50% & Casting Speed +50%
Movement Speed +50%, Fall Damage Reduction +50%, Jump Height +2m
Greatly increases Attack Power
Greatly increases Defense Power
Summons an object that heals targets in an area
Summon an object that attacks an area
Summon an object that reduces Movement Speed in an area

I dropped this one from pirates.

Just got one of the "Greatly Increases Attack Power" stone while grinding at Gahaz Bandits!

Movement Speed +50%, Fall Damage Reduction +50%, Jump Height +2m

Pure black crystal - Got it from grinding Fogans.

Выпало с Серой лисы Возле Хиделя