Human Skin Diary, Retroactive Dungeon

The moment Librom finished speaking, it opened on its own. Its pages flipped rapidly before stopping near the middle, where a string of text swiftly emerged across the blank pages.

``` [Book of Ys Heart (Human Skin Diary-Enchanted Librom): Dark Gold Mythic (Temporarily Advanced)/Lv.4, Heart Shrine Priest Profession equipment, off-hand catalyst. Equipment Requirement: Heart Shrine Priest. Durability 60/60. Carrying Requirement: Defeat the Elder Dragon and purify the New Continent's leyline core.

Earlier omitted.

Human Skin Diary-Enchanted Librom—

During the period of spatial stay, the holder could gain one opportunity to enter a "Retroactive Dungeon" by offering a sacrifice and reading the diary.

Sacrifices required to unlock access to a Retroactive Dungeon could be equipment, items, offerings, materials of a certain value, or specific objects requested by Librom. In theory, sacrifices had to be provided according to the number of participants each time it was opened. However, if Librom was in a good mood, no sacrifice might be needed; otherwise, even more sacrifices would be required.

The source material for Retroactive Dungeons consisted of Main Dungeons previously experienced by the holder and Contracted Teammates. They could be entered solo or by multiple people, with a maximum party size of five. Normal rewards could not be obtained in Retroactive Dungeons, and there would be no main quest settlement. However, all BOSS template units could undergo one redemption or sacrifice offering, gaining permanent improvements including, but not limited to, attribute increases, skill advancement, and Equipment Enhancement. If multiple people entered, each person could make one offering. All expenditures within the Retroactive Dungeon would be synchronized and reflected upon the original body.

The base difficulty of a Retroactive Dungeon was the difficulty from the corresponding period, though it could also be adjusted in advance to the level corresponding to the highest-difficulty dungeon the holder