| 1 person marked this as a favorite. |
My group actually had this exact issue pop up, with Dagon wrapping himself in an Antimagic-field to attack a city.
Our consensus, after about an hour of debate, was that anything Mythic could ignore an antimagic field. The basis for this was that Mythic powers can create artifacts (https://www.d20pfsrd.com/alternative-rule-systems/mythic/mythic-heroes/#Le gendary_Item_Ex), so Mythic powers, by default, have to be on the same tier as artifacts if not higher.
So Dagon himself, as a Mythic-tier creature and demigod, was immune to anti-magic field, but any of our Mythic powers, equipment or spells that had Mythic enhancements was also immune. Made it a fair bit of fun, since the party wizard had to be even more creative than the norm about what spells to Mythically empower, and it made the party feel more important since it gave a reason all the NPC's in the city were basically helpless against something with a stat block.
Except for one NPC ranger with Clustered Shot who ended up taking off about 100 of Dagon's HP, I guess.