Helsreach (2017)

When the world of Armageddon faces invasion by Orks, Chaplain Grimaldus and a group of Black Templars Space Marines are among those sent to defend it. Charged with the defense of Hive Helsreach in one of many onsets, the task seems forlorn. - A Warhammer 40,000 fan film.

Unfortunately the movie Helsreach is not yet available on HBO Max.