To download (titled "Phantom Lord") or the Opening 21 video in MP4 format, you can use the following official and reputable platforms. Official Streaming & Digital Purchase
If you are looking specifically for the sequence, it is often hosted on video platforms:
: Allows you to buy and download individual episodes or entire seasons of Fairy Tail in HD. Direct Video Links
In this episode, the Fairy Tail guild returns from an S-Class mission to find their guildhall destroyed by the rival guild, Phantom Lord. This marks the beginning of one of the series' most iconic story arcs.
: You can find high-definition versions of the Fairy Tail Opening 21 uploaded by community members. Depending on your browser or third-party tools, these can often be saved for personal offline use. Episode Information: " Phantom Lord " (Episode 21)