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The January 2009 update was published by Wizards of the Coast to revise a number of rulebooks and the Dungeon Master's Screen. It was the fourth update to the 4th edition rulebooks, and is also known as version 4 of the update document. The update was published on January 20, 2009, and each document included the revisions from the prior three updates.

Core rulebook revisions[]

The January 2009 update revised the three initial core rulebooks, the Player's Handbook, Dungeon Master's Guide, and Monster Manual. These revisions were published in separate documents for each rulebook as well as a compiled document, Update4E.pdf, for all three core rulebooks.

Player's Handbook[]

Revisions to the Player's Handbook new to the January 2009 update included:

Dungeon Master's Guide[]

Monster Manual[]

Forgotten Realms Player's Guide revisions[]

Forgotten Realms Campaign Guide revisions[]

Martial Power revisions[]

Adventurer's Vault revisions[]

Dungeon Master's Screen revisions[]