The Diablo 2 Wiki
The Diablo 2 Wiki archive is available for anyone looking for information on Diablo 2. All information here is pre-D2R but contains a lot of useful information that is still relevant. Updated sections for new D2R features can be found on the PureDiablo Diablo 2 section

Tree of Inifuss

From Diablo 2 Wiki

The Tree of Inifuss is an ancient tree with magical properties. It's found in the Dark Wood of Khanduras.

The mystical tree