Fight as a Xen alien grunt through the great levels of Half-Life: Chronicles: Episode One plus a Xen training course...
Xen-Warrior is another "POV" mod, this time putting you in the shoes of Alien Grunt - Warrior 1865, who is tasked to help Xen creatures fight the human enemies in Black Mesa Research Facility after the Resonance Cascade. The mod does not interfere with the originals, so it creates a nice fan-canon. The mod lets you revisit already seen areas from the originals as well as access a few new ones! Sadly, the mod is way too short, so you won't be visiting alot of those, as you can complete the mod in just around 30 minutes, if you spend your time exploring. Xen-Warrior also has a few bugs, but it shouldn't be a problem for the most part.