The Forgotten World is Silkroad's late-game dungeon chain, split into four increasingly difficult sections:

Togui Village — levels 35-70.

Flame Mountain — levels 71-90.

Shipwreck: The Green Abyss — levels 91-100.

Shipwreck: The Sea of Resentment — levels 101-110.

Each section is quest-gated — you'll need to pick up the entry quest from the right NPC before you can go in — and every mob (plus the section's unique boss) must be cleared before the door to the next area opens, so bring a full, capable party.

Clearing a section rewards talismans (which you can activate in your collection book or sell) and treasure boxes containing more talismans and tiered equipment — Sun and Moon weapons in the earlier sections, Nova weapons in the later ones — with a chance at rare, higher-grade options from each section's final boss.