Sacred Oak Spear

A spear with a shaft made of the wood of a still-living sacred ancient oak. The shaft is intricately carved with runes and animal figures. 

The head is fine steel but can become dull and break like any metal. 

The wood never chips or splinters, and metal weapons bounce off of it as if it were stone, but it is as flexible, springy, and light as the best wood.  

It is said that it can be broken, but a giant would have trouble breaking this shaft. 

If the oak dies the spear loses these properties.