Thanks! I want nothing else but to have a unique and familiar fantasy experience.

[quote=@Guy0fV4lor]
So if one was to have pure dragon lineage, would they be able to shapeshift back and forth? 
[/quote]

Yes and No.Yes it can be done, going back and forth. But it costs more the less experience you have with it.

[quote=@Guy0fV4lor]
Following that, if of mixed blood, but mainly dragon, is this ability retained?
[/quote]

Yes indeed but its more of a spell that works well with them rather than just an ability of theirs. The less dragon you are the harder the spell is. Same with any bloodline and their affinities.