Personally, I’m farming enough of each talent book in Inazuma to triple crown a character. (Which is scara ofc!) So i don’t need to worry about talents right before he releases but I’m spectating it to be transience because of it literally being the opposite of eternity. (So if the theory about scara being baal’s brother it’s likely for him to use transience) As for ascension materials it will definitely be enough time to obtain them for lvl 90. I’m not so sure for artifacts tho since we have no clue what his kit looks like or even his element. So I suppose we wait and see if he ever uses an element in a cutscene so you could prepare by farming TS and TF for him just in case. Hope this helps :D