Each statblock, NPC, and item gets a placeholder_*.png slot. Drop in art here; it bakes into the preview and the exported module.
Onyx Author
Version …
The authoring studio for the Onyx tabletop toolkit. Write adventure modules and player options in plain text, then export print-ready, play-ready Onyx files.
so this literal doesn't
// terminate THIS inline script in the browser (and the HTML parser still
// reads it as a normal closing tag in the exported file).
return '\n