They are permanently on your character.
They are Event Recipes and no different than any other Free Recipe you learn in the world.
Ancestral Knowledge is reserved for Paid Content.
Yes, but only on that character. Conan, like all survival games, gets very very boring after a time of playing. My husband and I will play for a few weeks, then quit for a few months until something exciting draws him back. Often times not even on the same server. There have also been times we’ve come back to a server we’ve played on before and our characters no longer exists.
Them being Event recipes is exactly what makes them different than what you learn in the world. They are limited time. It would be nice to earn things permanently on my account, it gives more incentive for players to even want to take part in the hunt. All you need to do is run the event twice to get the Werebear (which should be a Fodder Pattern if you ask me, so should the werehyena), and you never have to touch it again. Buy the few patterns you want and never look back. If they were account learned, I would be more inclined to run it a few more times so that I can buy everything. Event should make you want to keep running them. Earning something only on that one sever isn’t enough incentive to keep running it to earn all the things.
Also, twitch drops are not paid content. Plus the free stuff from the battlepass. 
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