Mythic Armor Mastery and Magi

[BishopMcQ]

If I'm playing a Magus, does the Mythic Armor Mastery Path Ability replace the ability to ignore Arcane Spell Failure, or does it upgrade the type of armor you are allowed to wear?

Example, as a Level 7 Magus, I can wear Medium armor without any Arcane Spell Failure. In order to cast without failure while wearing Heavy Armor, do I need to take the Mythic Armor path ability once or three separate times?

Thanks!

[Thaago]

You need to take it 3 times to get to heavy armor, unfortunately. The ability doesn't care about the Magus class features.