Complete an Abyss is a Harvest challenge.
Abysses start spawning in acts Act 6 and onwards and in maps. They have a 10% chance to spawn in each of these instances. Abysses are marked on the minimap with a green icon:
Upon walking over an Abyss, a crack will form on the ground, and a small number of monsters will spawn out of it. The crack will expand as you follow it. The crack will eventually spawn a pit, which spawns many more monsters, including rare monsters.
If the player takes too long to follow the crack into a pit or kill most of the enemies that spawn from the pit, it will close up. Otherwise, it will create another crack that leads to a different pit. An Abyss will normally create three or four pits, but since the cracks can’t cross themselves or each other, the Abyss may end prematurely if it works itself into a corner.
Clearing the enemies out of the last pit will spawn an Abyssal Trove, which can be opened for loot. In addition to generic loot, an Abyssal Trove will always contain at least one Abyss jewel, possibly more.
In zone levels 70 and up, instead of an Abyssal Trove, it may open an entrance to the Abyssal Depths instead.
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