Three keys to the secret door

And the last page of the diary... Our lands and Juno's lands have been separated from time immemorial by a secret door. To protect the neighbors from Tyrone, I locked this door with a key, used magic to split it in three and sent it to the heroes of Iris. Thus, it was no longer possible to open it from our side. Today I will move to Juno to check the door locks... I hope they're still intact. The text ends here. Apparently, Kroit killed the old magician and took his diary. But the door is still locked, and I'm not surprised: to open it, you need to combine all three keys, and no Forsaken will give his treasure to a fellow even for a minute.