The ones in Wakening Lands are dropping very little loot and no plat. The ones in crystal caverns drop both and are a little lower level than the Wakening Lands ones.
In the Crystal Caverns: Drops loot and plat. Highly resistant to cold and fire; perhaps immune? to disease and poison. Magic spells land normally.
In the Wakening Lands: Drops little loot and no plat.
In Crystal Caverns: Fragment of Fear: (no data)
In Crystal Caverns: Fragment of Fear (raid instance): Spawns as part of the raid event "Danela's Stand" (see this quest entry for information).
Black Pearl
Black Sapphire
Bloodstone
Chipped Black Marble
Coral Crescent
Crystallized Sulfur
Diamond
Emerald
Emerald Ring
Exquisite Embossed Rune
Exquisite Velium Embossed Rune
Fire Emerald
Fire Opal
Flawed Chrysolite
Flawed Emerald
Flawed Flame Emerald
Flawed Flame Opal
Flawed Lava Ruby
Flawed Opal
Flawed Sea Sapphire
Flawless Aquamarine
Golden Pendant
Imperfect Diamond
Jade Ring
Jaundice Gem
Mithril Amulet
Nephrite
Opal
Opal Bracelet
Pearl Earring
Pearl Necklace
Pearl Ring
Peridot
Petrified Holgresh Eye
Ruby
Rune of Concussion
Sapphire
Spell: Fixation of Ro
Star Ruby
Star Ruby Earring
Velium Silvered Rune
Words of Abatement
Words of Cazic-Thule
Words of Duress
Words of Neglect