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.
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Lawful is a separate requirement - the weapon needs to be lawful (from the axiomatic quality, or from the align weapon spell or something). Having an enhancement bonus of +5 (not +5 equivalent) will also do if you can't get a lawful weapon.
Epic and lawful means the weapon needs to meet both requirements to bypass the DR. A +5 flaming weapon will do, or +4 axiomatic, but a +3 flaming frost corrosive weapon won't. The requirements aren't added together, you just have to meet both.
This is not actually correct. As noted here, only the enhancement bonus is counted. A +1 enhancement bonus weapon is needed for DR/magic, while a +6 enhancement bonus (NOT price equivalent bonus) is needed for DR/epic. No weapon enchantments aside from the enhancement bonus or the alignment properties will ever affect a weapon's ability to overcome DR.
Now this is a puzzle. You read correctly, ordinarily any weapon with a +5 or higher enhancement bonus would overcome DR based on alignment. This rule (along with +3 or better doing some metals, +4 covering adamantine) is new to Pathfinder, it was not a rule carried over from 3.5. As such, this is a gray area, but I believe I have the answer.
Certain effects allow the bypassing of DR without their weapon possessing the necessary properties. Most notably, Mythic characters can gain the ability to overcome DR/epic. In this case, when fighting Cthulhu, a Mythic character with this ability would still need to overcome the lawful component (either by possessing a +5 weapon, or a suitable Align Weapon spell, the Axiomatic Enchantment, etc.)
Hope this helped!
Additionally of note: Some attacks ignore DR entirely, such as a paladin's smite evil, an Antipaladins smite good, warpriests and fighters have archetypes for smite, inquisitor has faith hunter
Also from Mythic Adventures: "DR/Epic: A type of damage reduction, DR/epic can be overcome only by a weapon with an enhancement bonus of +6 or greater. Weapons with special abilities also count as epic for the purposes of overcoming damage reduction if the total bonus value of all of their abilities (including the enhancement bonus) is +6 or greater." Emphasis Mine, on the d20pfsrd it's listed here,But this means any Vorpal weapon will ignore DR/Epic, as will a +5 axiomatic weapon. If your DM uses the mythic rules for DR/Epic rather than the base ones where the actual enhancement bonus has to be +6