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.
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.