Addon items, which can be cut from monsters rarely loots, so we go to Riona and buy obsidan knife and blessed wooden stake. 

Items, which can be cut using obsidian knife:

1)Minotaur Leahter  

2)Red Dragon Leather  

3)Lizard Leather   

4)Green Dragon Leather 

Items, which can be cut using blessed wooden stake:

1)Vampire dust

2)Demon dust

How to get these items?

After kill, we have to wait about 10 second, right click obsidian knife and left click on monster. Sometimes we will not get skin.

Same with dusts.