Wood Release is a Kekkei Genkai created by mixing Water Release with Earth Release. This Kekkei Genkai is quite rare and hardly ever occurs naturally, which is one of the many reasons why it is coveted. Hashirama Senju, the First Hokage of Konohagakure, is the only person in the series known to possess this Kekkei Genkai naturally.
Wood Release Was Used To Create Konohagakure & Can Thus Help Create The Foundation Of A Village
As mentioned earlier, Wood Release grants the ability to alter the terrain to the user and while it is quite impressive in combat, it has great utility outside of fights as well. This was seen when Hashirama Senju and Madara Uchiha joined forces to create Konohagakure