One of the two guys behind this mod posted about it on the Half-Life 2.net forums, it looks pretty interesting and well developed for five months of work. Kingdoms Collide is a fantasy themed total conversion mod for Half-Life 2. In the own words of one of the developers of this mod in their post on the forums:

The idea of the game is to have really fun and balanced online multilayer combat with a very high potential range of skill and is all found within a beautiful fantasy setting, the character using a third person camera (so the melee aspect makes sense, unlike FPS camera melee games where people run around like headless chickens unable to see their suroundings). Also, like most typical fantasy RPGs we wanted to have a good level of character customisation in choosing a unqiue weapon and skill set that suites you – as well as making each player able to have unique role within their team enabling incredible depth to teamwork, tactics and strategy!

Video of an early alpha below: