Kotaku: Dragon Quest XI is a very long game full of tragic twists and turns, so when my journey finally came to an end, it felt like a real accomplishment. The credits rolled. Id defeated the main villain and brought peace to the land. I actually felt sad that my time with my companions was coming to an end because I liked them so much.
There was a The End screen marking the quests conclusion. I was about to turn the console off when to my surprise, another line of text followed that read to be continued…
Thats when the post-credit sequence began.
Source: N4G PC The Difficult Dilemma of Dragon Quest XIs Post Credit Sequence