This article contains information, pictures or media from non-canonical sources. To find out more about what is considered canon see LOTR:Canon
They battle in pairs, and are designed for fighting in tunnels underground. One uses a large tower shield to protect both members of the team and hold off attackers by sealing the corridor using it; the other fights past the shield using a very long spear.
Vault wardens are not mentioned in any of J. R. R. Tolkien's works and were invented solely for The Lord of the Rings Strategy Battle Game.