No! My phone did something weird and it ate my reply! Gotta type it all out again. *drink*
Ohai! Didn't see you there 
*Beren shoves a DP Roy's way and helps himself to a bourbon*
Actually, moving beyond your smallclothes, which don't get me wrong are probably a fascinating subject in their own right, I need archer advice for Luthien. Specifically specialization advice. I know, I know tempests rule (and dieb would say artificers do), but why? To be totally frank, I'm looking at this tree and trying to figure out how it's great for an archer. I mean, even the focus ability's name heavily implies it's for a knife cutter.
No big rush at all. Don't have the materials yet anyway. Assassin archer sounds cool, ya??
It's all about how you use the flasks. Flask of fire allows you to spam long shot, leaping shot, and Explosive Shot which are all devastating (don't use it for full draw because of the long animation). Leaping shot does tons of damage so being able to spam that 5 times will do serious damage. Long shot, upgraded, has a short animation and can take out multiple targets at once. Explosive shot has the bonus of knocking enemies down so knocking them down over and over is fun. Flask of lightning can get you out of a tight spot and deal some damage as you get away, or unleash the fury of app your abilities before the enemy can react. Flask of Frost boosts armor and freezes any clowns that get close. Great against shadows and stalkers. Hit them with a Longshot afterwards to shatter them. I don't use the spec specific focus abilities, mark of the rift works just fine for me, but thousand cuts can annihilate bosses. There's a reason Sera is a great dragon killer. Don't need knives to use it, just get close to your target.
Assassin archer is a beast. Artemis, my first lady elf, is an assassin archer and she rips through every thing. That mark of death, man. I was able to do almost 90k damage to a dragon with it. Solas better watch his back for her.