[@Grec]In the original version (made by me in another RP) the Umbra were dealers of dark powers to most evil of persons. (Example : you need the power to kill your rival, it shall be given to you in exchange for let's say...100 children or things of similar value) While also giving dark powers to people in order to kill those that would dare to double cross them.

So in other words. Go ahead but remember, only the Harbinger (William or his predecessors) is known by other persons. So if somebody would ask how a...Lasombra Vampire got their shadow powers, the answer would be something like "A strange being that was shrouded in darkness gave them the powers".

Is that ok ?