Keeper of the Holy Relics. Counts as Vulkan He’stan

Charged with finding the most secret and forbidden of technological artifacts from the Dark Times before the coming of the Emperor. Also charged with guarding all the chapter sacred weapons.
When he marches to battle, he hands out these weapons of war to his battle brothers, equipping them well for the trials and tribulations ahead. he himself carries several ancient weapons, whose secrets of construction are long since lost.

(Conversion was not done by me, it was done my Lamenter, you can find his website here:
Painting was done by me.) 

And my Terminators + Sicarius in action last Sunday!