A quick delta class lifting heavily from Austin Walker's Realis. Take it as a starting class, or add it to a pre-existing character for a different kind of narrative arc. It should comfortably layer on top of whatever dice-based resolution mechanics you're already using.
Back when I started planning Northern Lights as a GLoG campaign, I wrote up an alternative to Monster XP/Milestones. They've remained basically unchanged since, and they're a close second to Tread as personal Design Highlights go.
This Sunday marked the first session of my GLoGhack's inaugural playtest. The team is going through Skerples' Tomb of the Serpent King, let's see how it went!
After much ado, I've organized the basic rules of my gloghack into a single document! It has all the basics for chargen and dungeon-scale gameplay and my next step is to solidify the overworld exploration loop and larger meta-progression mechanics.