Set your first-line indent to 0.2" (5 mm) and avoid using extra spaces for alignment.
If you are creating your own "Bestiary" draft within the EPUB, use a structured format for the monsters, similar to how Axlin writes them: (e.g., Los Robaojos / Rob-eyes) BestiarioAxlin.epub
Use Heading 1 for chapter titles and Normal for body text to ensure reflowable text fits any screen. Set your first-line indent to 0