@trenloe
just a heads up - a player rebuilding their character revealed an error with the current FG version of "Scales of the Dragon" archtype feat for dragon disciple archtype in APG - it's been errata-ed, and now reads...
Page 168-169: Dragon disciple has a couple errors. First, the dedication feat should make you trained in arcane spell DCs and spell attack rolls, in case you need that training when picking up the later feats that give you arcane focus spells. Second, the armor bonus from Scales of the Dragon feat should change to match the errata to Animal Skin and Mountain Stance in the Core Rulebook. The final text of that section is as follows: "When you’re unarmored, the scales give you a +2 item bonus to AC with a Dexterity cap of +3. The item bonus to AC from Scales of the Dragon is cumulative with armor potency runes on your explorer's clothing, mage armor, and bracers of armor."
https://paizo.com/pathfinder/faq
Current version is I assume the old version - either way, it definitely doesn't read like the current version - hope this helps