I looked at The Asterisk War but there's also season 2 on Netflix or where else would be happy to get an answer
No, there's only Season 1 on Netflix
How many episodes was it? From what I read, the actual two seasons, each with 12 episodes, were added together on Netflix. In that case you have already seen everything.
There's only one season with 24 episodes. If you want to know how to proceed: read the light novel (EN only)
Where can you see season 2?
There's no season 2
Goods 24. Can I see it elsewhere so season 2
No
Then you have already seen everything. https://www.wakanim.tv/...sk-war-omu also offers the anime, but these are just these 24 episodes, just properly divided into 2 seasons with 12 episodes each.