You can watch the complete series with dual/multi-audio options (including Hindi and the original German/Latin) exclusively on Netflix . Why you might see "Season 12" online The confusion often stems from two unrelated sources:
If you are looking for historical action with Hindi audio, here are the actual alternatives released around 2021: barbarians season 12 dual multi audio hindi 2021
There is also the History Channel documentary series Barbarians Rising (2016) or the older Barbarians (2004-2007). These series do not have 12 seasons either. The 2004 run ended after 2 seasons. No version of a show titled strictly Barbarians has reached 12 seasons. You can watch the complete series with dual/multi-audio