What are some of your headcannons for non-mage Lavellans? I even think mine can barely read. Wouldn't that be something taught only to the First? I don't know if there's any codexes about it, it kind of feels right. I'm just worried that they won't have a lot in common since she's not mage, y'know? What would be her reason in being interested in the Fade? I know she would be interested in knowing about her culture~
Stupidly indepth are my Lavellan headcannons. My non mage Male Lavellan goes like this:
Tristan is a bit of a self insert and heavily influenced by a piece of criticism I have had thrown at me my whole life "You have so much potential but you have no ability to apply yourself."
He is potentially my smartest Inquisitor but is just too lazy to bother. He's far to interested in sex, drugs and rock aaand roooll (or something like that)
His parents couldn't deal with him, his clans could never deal with him. Just one person could, his younger brother.
I ran with the idea that his younger brother started showing signs of magic at around 9 years old (Tristan at 12) and was given up to his aunt's clan (Clan Lavellan) to become her second. Tristan refused to be separated from his brother and his parents didn't put up much of a fight to keep him. So off they went.
Tristan can read and has a strange amount of knowledge and interest in magic because he helped his brother out with his study. It's why he also doesn't fear it (his brother is a bit of a soft touch which is why Tristan is so protective of him) and why he chose to ally with the mages.
He became so close to Solas and Dorian partially because of that familiarity with being close to a mage user. So they became his tutors within the Inquisition. Dorian forced him to sit down and read and Solas gave him all the history and magic lessons. Josie was there to teach him how to be civil 
I love the whole Dorian/Solas tutorial team though because of how close they are in Skyhold. Tristan would sit at Solas's desk and be tested by him, while Dorian can stand looking over the railings giving feedback and throwing books at him.
My beautiful man trio. Oh man. Now I want my DLC man trio reunion again.
*weeps*
I don't think it works for me. Lol. I'm an artificer and it never last long enough to get anywhere with my cooldowns. I'm probably doing it wrong.
I ran as an artificer on nightmare with my archer. Spamming leaping shot during the focus ability time made for quick dragon kills so long as you don't fall through the map. This happens, a lot.