EXP_Documents VS itdr

> Creating a theme for tabletop role-playing games would take some elbow grease

The article links to several, including a convincing reproduction of basic Wizards of the Coast house style for D&D 5E:

https://github.com/rpgtex/DND-5e-LaTeX-Template

Here's another 5E one with additional sidebar styles:

https://github.com/anoderay/DND-5e-LaTeX-Template/

Also 5E-inspired, with a template for card accessories:

https://github.com/Krozark/RPG-LaTeX-Template

A 5E-compatible character sheet:

https://github.com/matsavage/DND-5e-LaTeX-Character-Sheet-Te...

CTAN also has packages for Basic D&D-inspired typesetting (rpg-module, also linked from the article), GURPS (gurps), generic hex boards (hexboard), and wargame hex boards with counters (wargame).

There are also indie TTRPGs that've shipped using custom LaTeX templates; this one has CC-BY licensed source: https://github.com/ludus-leonis/nipajin

And the blog author's own, with a more restrictive CC-NC-SA license: https://github.com/Vladar4/itdr

From personal experience, the biggest struggle is non-rectangular text wrapping around images.

Of course, see charsheets.zip at itch.io, or release page.

Into The Dungeon: Revived is written in latex, and is CC-BY-SA. Additionally, the Cairn Bestiary is written using a tex template.

That's certainly an option. Games like Liminal Horror and Into the Dungeon Revived host versions on GitHub. You can then render it to a GitHub.io page using something like Just the Docs.

There are Scars in Cairn (just like in Electric Bastionland) but for advancement specifically it would be simple to use Into The Odd or Into The Dungeon: Revived advancement rules!