I'm not sure this force will be my next DIY, but I felt that even this tidbit would be appropriate, given the recent updates to the Basilisks. The Pythons will receive updates, too, just not 100% sure how soon.
Chapter Datafile: Baal Pythons
|Progenitor Legion||Blood Angels|
Originally known by the name of the Blood Angels' homeworld, their time in the warp and loss of their own records have corrupted the speech of the Baal Pythons, who now identify themselves with a mispronunciation of their former name. Inquisitorial records of the Cursed Founding name the Pythons among the Chapters created, but from the very date of their sanctioning until 198M41 the Chapter has no registered appearances on any battlefield, nor submitted any tithes, but has been lost to all Imperial knowledge. Curators were hesitant to label the Chapter as destroyed when it was unclear whether or not a single marine was even created. Such is no longer the case.
Having emerged from the warp transmitting dated imperial codes and bearing the heraldry recorded under their name, the Baal Pythons have returned. The fleet transmissions of the Pythons lasted less than an hour, and were heavily encrypted. To date only portions are understood which appear to implicate the Basilisks Chapter in heretical gene experimentation. The Pythons did not remain to be questioned, but fled again through the warp at the appearance of the first Imperial vessel. These encounters repeated until the Pythons finally appeared to find what they were looking for: The Basilisks' fleet. An Imperial Navy patrol found the Pythons with a sizeable fleet engaging the Basilisks in ship to ship. When Navy forces called for a cease fire, the Pythons turned their guns on the Navy ships, destroying one as they fled again into the warp. Remains recovered from the battle reveal that the Pythons have been horrifically mutated, and they have since been declared Excommunicate Traitoris. What remains of the Chapter continues to harass the Basilisks while avoiding other sources of Imperial contact. They have begun to make open transmissions once more, but their garbled broken language and persistent outdated codes have made their intentions unclear.