I am just starting out playing DH and I have a question regarding how to figure out what a group of players can take on at different levels. The DnD system uses CR to determine what types of monsters the PCs can fight and how many they can take on at their level. With DH, I don't see anything similar. I do notice they rate their creatures by if they are minor threat to a major threat. However, I don't know how many creatures I can attack the PCs with, at there given level, or what type I should use. I'm wondering what is a good rule of thumb to figure out how to make a combat encounter challenging for PCs at the different levels without a TPK or making it a breeze. Thanks