Libram of Tenacity

Confirmed in gameFrom the beta client, and the game shows the same numbers. They can still change before release. Why Blizzard hides items

Uncommon, Recipe, Book, item level 50, requires level 50, item 11734. All items

Same as Classic: the tooltip reads the same in both clients.

Classic Era 1.15.9.69722

Libram of Tenacity

Item level 50 · item 11734

Unique

Book

Requires Level 50

"Dark runes skitter across the surface."

Forever beta 1.60.1.70338

Libram of Tenacity

Item level 50 · item 11734

Unique

Book

Requires Level 50

"Dark runes skitter across the surface."

HiddenDataminedConfirmed in game

Read from the game clients' item tables through wago.tools. Some Forever items are not in those tables: Blizzard's server sends them to the game the first time it meets one, and we read the ones our game has received from its cache. The Forever client's stat amounts, armor and weapon damage are computed from its item level budgets the way the game computes them. Names, icons and item data © Blizzard Entertainment.