Hi so I'm new to Pathfinder (and PnP RPGs altogether) and am preparing to run my first adventure as GM.
I was looking at some of the creatures in the bestiary and noticed that higher level creatures have ACs higher than 20. If you make an attack roll with a d20 to see if you hit something, how is it possible to hit something with an AC of say 23? I realize that rolling a 20 always means you hit, but does this mean that the only way to hit them is by rolling a 20?
Thanks so much!