Reading 'Heavenly Tyrant' legally online can be a bit of a puzzle if you're not sure where to look. It's not as ubiquitous as some mainstream titles, so your options are specific. First, check if your local library's digital service, like Libby or Hoopla, has it. Libraries often purchase licenses for popular series in the translated novel space, and that's how I got my start with it. I borrowed the ebook, no cost, perfectly legal. It's worth the search in the catalog because library availability can be spotty by region.
If the library doesn't pan out, the major ebook retailers are your next stop. Amazon's Kindle store definitely carries it, and you can usually read a sample before buying. Google Play Books and Apple Books are also reliable sources for purchasing the digital version. I prefer having a permanent copy on my Kindle app, so I bought mine there. The translation and formatting from official sellers are usually top-notch, which matters for a story with such intricate cultivation terms and names. Sometimes the official publisher's website, like Webnovel or the specific publisher's portal, might have it for direct purchase or as part of a subscription, but you'll need to check which one holds the official license for your region.
A word of caution: you'll see a lot of fan translation sites pop up in search results. While I understand the temptation, especially if you're eager and can't find it elsewhere, those sites operate in a legal gray area at best and don't support the author. The official channels might require a bit more effort or a few dollars, but it ensures the creators get compensated for their work, which keeps the series going. I found the official ebook price to be very reasonable for the length and quality.