Kilian
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Don't worry too much. When he starts snowballing in power due to arithmancy nobody will complain. Different matter though, why didn't he consider hiring assassins to deal with Lestrange? I know Dumbledore wouldn't come up with that idea but he at least should consider spending some small portion of his wealth to solve that problem instead of focusing on influencing the schools. He needs a more short term solution to combat the purges in France.
Study it and then cure yourself and then do the same as a werewolf. Should be able to make some great improvements to yourself and the restored. Don't be too greedy though as long as you are a vampire/werewolf Molag Bal/Hircine (normally) get your soul if you die. You really don't want that to happen.
Cap's Serum is easily doable. The question is if he will settle for just that. There are still other kinds of serums (sentry's/extremis/bruce banner's etc) and you can also artificially add a X-gene. Why stop at just a little boost in power speed and stamina? One bullet would still kill him. In Marvel go big or go home.
Wow it is great to see an update again. It certainly came as a surprise. Since the original owner of the space ring was such a high level to use universal travel then it should also mean that there are lots of high level resources in the ring itself. Since the ring itself is still intact so should be the things inside.