The Lost Black Key

Oh no, it seems you've lost the item. This affects the entire organization! Alright, I'll let this one go, but you're going to have to collect another Zombie's Lost Tooth right away.

Well, it's just like last time... No, actually, that's not going to be enough. This time, you're going to have to collect 300 Zombie's Lost Tooths and deliver them to Shammos. Only then will Shammos give you the item again.

Hehe. So you want me to give you the item again? Alright. I've made like 10 copies of the key anyway. Kekeke!

You can enter the Forest of the Dead through the rightmost door on the bottom floor of Chief's Residence.

Kekeke! Such a dark force...

Honestly, one mistake is enough. If you are making yet another mistake by refusing to take on this assignment, then I just don't know if you'll be excused again.

Don't tell me you haven't brought 300 Decaying Zombie Molars to Shammos yet! Hurry! It's very important!

What is it? You want me to give you another one of the items? Hehehe. Well, if you want another one of those, you're going to have to bring me 150... No, no, 300 Decaying Zombie Molars!