Mastering the Intimidate skill is difficult, probably more so than any other skill in the PHB. Intimidate is availabe to 12 classes (as shown in our Skill Matrix by Class) making it the most widely available skill (along with Athletics and Endurance). If you’re playing a class like the Fighter where you have very few skills to choose from, Intimidate is a very popular choice.
Despite the large number of PCs who take training in Intimidate, it’s a skill that has very limited uses. Using Intimidate during a skill challenge often counts as an automatic failure. If not, then you usually get only one try with Intimidate. In a perfect scenario a successful Intimidate check brings you one step closer to accomplishing the objective of the skill challenge. If you fail it can make future checks more difficult and count as one more strike. So it’s important to know when to use Intimidate and when to rely on a different skill.