Should also mention that there is another version of the keys called Imbued Sword Key they look similar but the Imbued are slightly blue and are used on the imps on sending gates. I had to look it up because I had one but had no idea what it was for.
the Radagon's Scarseal and Soreseal stack with eachother as well, so you can benefit by equipping both and it wont hurt to use them past level 60. the damage you take is minimal at that point in the game. any boss or enemy that can kill you in two hits will kill you in two hits with them off or on so its just a matter of preference
I just downloaded Elden ring a week ago and this is my first souls game, thanks for this video it’s super helpful and you definitely deserve more subscribers!