Page Title

This is the final 10th puzzle from the series

And this is the most difficult puzzle I've ever created

Some hints:

Check the JS tab to understand how algorithm works.
Gather all the keys from last 9 puzzles (go to my profile and scroll down). You can't do anything without them.
Check the code piece below, you will need it too.
Good luck!

Letter shift:

M«¤·j¶c¤¯¯qc«¨c©¬±¤¯c³¸½½¯¨qM·cº¤¶c¤c¶°¤¯¯oc¥¸·c¤º¨¶²°¨c²¸µ±¨¼qMc«²³¨c¼²¸c¯¬®¨§c¬·qMc§²±j·c«¤¹¨c¤±¼c²·«¨µcª²²§c¬§¨¤¶c¤¥²¸·c±¨ºc³¸½½¯¨¶c·«¤·c¤µ¨±j·c¶¬°¬¯¤µc·²c³µ¨¹¬²¸¶c²±¨¶qcc°¨c¬©c¼²¸c«¤¹¨ocº²¸¯§c¥¨c¬±·¨µ¨¶·¬±ªc·²c¯²²®qM¸·c©²µc±²ºcj¯¯c·¤®¨c¤c¥µ¨¤®qcj°c¤c¥¬·c¥¸¶¼cº²µ®¬±ªc²±c²·«¨µc³µ²¨¦·¶qMM¥¼¨c𰂎M

[...nums].reduce((acc, el) => {
    el > acc ? acc + el : acc - el
})

puzzle 10: THE END