Viper Legion

Viper Legion
Battle Cry	Unknown
Founding	Unknown
Successors of	Unknown
Chapter Master	Unknown
Primarch	Unknown
Homeworld	Aurelius
Strength	Unknown
Specialty	Unknown
Allegiance	Imperium
Colours	Unknown

The Viper Legion are a loyalist chapter of Space Marines. Only three things are known about them aside from their name:

1) They are based in the Aurelius System.

2) They're part of the Astartes Praeses.

3) One of their sergeants got killed by Hecaton Aiakos in a friendly fire incident once.

Considering they are called the Viper legion, snakes probably have some role in the icons/colours of the chapter. If that is the case, perhaps they will end up looking like space versions of the snakemen from the Conan the Barbarian cartoon. Or a sci-fi version of Warcry's Splintered Fang warband.

Symbol of heresy-era Iron Hands clan Ungavarr. There isn't a lot of sepentine iconography in use among Space Marines, but given the total lack of information about this chapter, one can only guess...