Damage Reduction Question
Please note that I am new here, so I apologize if this question/post doesn't belong here.
I am a long time fan of classic 2e/3e D&D (before the Epic classes were introduced, let alone the to me bad 4e and 5e) so I know a lot about the game and enjoy it. However, one thing has always puzzled me... damage reduction values.
Specifically, for example, Pathfinder Cthulhu's damage reduction is listed as "DR 20/epic and lawful". I know the 20 part is that it soaks 20 physical damage unless the attacker has a magical weapon that is a certain enhancement bonus of X or above. Now if the DR had read "20/+11" then I know that I would need a +11 weapon or better to bypass Cthulhu's damage reduction.
I have also heard that any "epic" damage reduction is at least +6, and any alignment is +5, but how much damage reduction, in this example, does Cthulhu have? Is it 20/+11 or am I missing something?
Understanding his damage reduction would greatly help me know what +X weapon I need against him.