Heading out the west side of Tihark Orchard then entering the nearby portal on the right will give you access to the Nightfallen Garden. This area name does not appear on the main map. The map layout is similar to Garden of Seborhin but a look similar to the Realm of Torment.
This area is part of the Realm of Torment and thus does NOT count towards the Cartographer title track.
Upon completion of the game, this area reverts back to the Garden of Seborhin.
After completion of game you can keep both Nightfallen Garden AND Garden of Seborhin active for choice in farming IF you keep the quest Heart or Mind: Garden in Danger active. However, this will preclude you from the Protector of Elona Title because the quest is required to activate the Jennur's Horde (mission).
Although it is in Vabbi, it counts as part of the Realm of Torment and contains Margonite Chests.
This is good spot to farm early Lightbringer points, particularly in the central pit where there are dozens of Margonites in very pullable groups. Just get to the appropriate shrine with as little combat as possible. The quickest way in is probably down the stairs in the southeast corner.
The Margonites in this area are a bit buggy, and can often be seen attacking other groups, including Shadow Army, Torment Creatures, occasionally the Graven Monoliths that they often spawn with, and even other Margonite groups. Be careful not to be crushed between such a conflict if you decide to fight the two groups, as both are still hostile towards your party.