Hard "rules" of Thedosian magic:
- You can't teleport.... but you can make an ILLUSION that allows you to move from one place to the other in the blink of an eye.
- You can't cheat death.... unless you're an ancient elf named Mythal or Solas... or a darkspawn magister... or potentially Avernus - or whatever other means of "effective immortality" exist.
- The magisters would have had to have unbelievable amounts of lyrium to breach the Fade for seven of them... but Jowan needs just "a bunch". Instead of lyrium... they slaughtered thousands to get in bodily... Jowan... just killed one obnoxious Orlesian and that seems to do the trick.
- Golems are terrifying things to create with the anvil of the void... pouring molten lyrium into a vessel containing a dwarf.... unless, you're Shale... and then you can get crystals... how does that work? Who knows?! The point is... Shale is cool.
- The Urn of Sacred Ashes... lyrium seems to be very compassionate to human messianic martyrs. It creates not only healing ashes instead of... oh... ANY other type of ashes imaginable... but it ALSO creates a whole experience devoted to Andraste... cause.. wtf not? One would think lyrium would do this all the time across Thedas... and yet, nope... just for YOU Andraste.
- Spirits have no imagination... they have no ambition... they don't change, until they totally change... like all the time. But, good thing they can't come into Thedas... until, yeah... they're all over Thedas. But, demons love inhabiting mortal bodies... until, why make abominations (or Sylvan or undead) ever again - when we can just become scared mage boys locked away in a dungeon?
- Can't reverse tranquility... until you can, and we always knew you could! And... umm.. that's how we make Seekers... because Tranquility can happen without you knowing it during a year long prayer retreat... what?
- Hedge mages... mages that just make up magic as they go producing unique results Circle mages cannot reproduce.
- Oh, and now we have "sending stones" because.. why not? But.. only one... and we're not going to study it - we're going to put it in Calpernia's house so she can have it back. Cause... everyone walking around with a sending stone in their pocket would be mass producible and revolutionize Thedas... but - it's not a science so these are rare and mysterious items.
A lot of unique circumstances - and one shot wonders - for a reliable, predictable, reproducible "science".