[@Bartimaeus]

Most of the traits like "Hot blood" and "shadow step" are self explanatory. But how it is specifically used can be up to you. This is to say the hint of vaguely described powers can be molded to have a more specific effect by spending exp on it. Such as "Hot blood" for example doesn't do much on its own, but spend some exp on it and it can be boiling hot blood that burns when it escapes your body and can be used to blind foes or damage them in general. Otherwise it will just be normal hot blood that may or may not be useful.

More complicated blood line powers like shadow step will remain in its generic form (unless exp is spent on it like any other). Granted that's not a obvious thing even among those who are D&D enthusiasts. It essentially would be stepping from one shadow to another. 

I see I have some more improvements to make to the details. Ask anymore questions or suggest something to make things more appealing if you'd like. The % does not mean you have that % of it working its the amount you will need to be able to have that blood ability.