(…) Beyond the Wall, some elements of which I may combine with OSE.
Let me guess: character generation?
Yeah, same here. And I'd put the level cap at 6th. There is a lot about the PF1E system that I like, but I feel like the game gets really bogged down in math at mid- to high-level.Then my choice would be Pathfinder.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.