Why would Kortan use a mortal as the key to his swordvault?

[Nicholas Ward]

Lovely as Malone is, a mortal body wouldn't be a great choice to use as a key.
After all, wouldn't it be very possible it becomes very difficult to open the vault when Malone would unexpectedly die?

https://makeagif.com/i/tEedft

[dubiousbystander]

*straight face* Because you need to frequently change passwords. Hahahaha