There are only 20 episodes in total (10 per season).
The show faced several hurdles that prevented it from reaching a third season, let alone a twelfth: Network Shifts: the shannara chronicles season 12 dual audio
No episodes were produced. However, author Terry Brooks has continued the book series. The television show covers only the first two books of the original trilogy ( The Elfstones of Shannara ). The third book, The Wishsong of Shannara , was never adapted. Consequently, exists solely in search engine clickbait. There are only 20 episodes in total (10 per season)