Dark Fissure (Online)

Were you looking for the Oblivion location of the same name?

are large portals to Coldharbour that summon the Daedra of Coldharbour to do the bidding of Molag Bal. As well as Molag Bal's massive Dark Anchors, he uses Dark Fissures to summon his warriors to further plunge the land into chaos.

Notable items
Armor and Weapons can sometimes be found when defeating the boss at the final wave of the fissure. Also among these are Soul Gems, crafting materials and gold.

Enemies
Just like Dark Anchors, most, if not all Daedra types appear at Dark Fissures.

Trivia

 * Dark Fissures were originally not going to be included in The Elder Scrolls Online. With the February beta session, they were added to the game in a large update.