Thank you everyone for the input on lyrium! I really appreciate it! I know that the devs intended to implement a system of diminishing return for using lyrium in-game. So, there was this idea that it becomes less effective with prolonged use. Maybe Templars start off by ingesting small amounts, then the dosage increases, then the delivery method has to change to maintain effectiveness.
As far as mages is concerned, even being close to raw lyrium can kill them. They are much more sensitive to it, apparently.
My idea is that in small amounts, lyrium will confer magical abilities (augment mages' powers, and give Templars their unique abilities). In large amounts it nullifies magic by blocking the connection to the Fade - hence its use in the Rite of Tranquility. And for Templars, it confers some resistance to magic?
One more question: are Templars resistant to blood magic?
EDIT: I have gathered images of the "lyrium kit" and DA:I Lyrium bottles in all position that I can find in-game. Interested or you already have it?
Yep, interested
I could use a good reference 