Witch's Pact

Witch: What made you come here to bother me again?
You: You made me shrink! This wasn't our deal. You have to change me back please
Witch: Hmm...We could have another deal.
You: What is it?
Witch: I will make you the potion you need if you kill Demon Cali..
You: ...How do I do that?
Witch: There is only one way, you need to find things that can form the sword to kill him.
You: What do I need?
Witch: Ugh just find it out yourself! Go on get on with it!