I am a new GM playing D&D 4e. I have a question regarding the Alertness feat. In the Compendium it is described as the following:
Benefit: You cannot be surprised. Also, you gain a +2 feat bonus to Perception checks.
My understanding is that the character gets a boost (the +2 bonus) on Perception, not "Passive Perception". I assumed he has to roll on passive perception if he notices an ambush, is that right?
So how does this translate to the game in regards to not being able to be surprised? E.g., if a character has a passive perception of 5 + the roll (let's say 3), his result would be 8, which might still not be enough to notice the ambush (DC for this would be 10). Is he the surprised, or not?
Or does not being able to be surprised mean then the attacker can't get a surprise bonus on his attack roll? Anyway, the attacker would still get the first attack if his target missed the passive perception roll, right?