Beleriphon
Totally Awesome Pirate Brain
ccs is closest to what i mean. i heard there was a revised beastmaster ranger (and a few other classes; possibly the four elements monk?) posted by wotc, presumably to make these classes a little stronger.
17. why was mage armor changed to +3? is this part of bounded accuracy?
18. where are the magic item creation rules? in the dmg?
As noted its a formula that is AC = 13 + Dex mod. That's it.
There are something sort of like them Xanathar's Guide to Everything.
As a quick note on a previous question. There aren't skill checks per se. There are attribute checks, which if you are proficient in a skill the DM feels is appropriate (with some solid examples provided) you get to add the proficiency bonus.
For example jumping over a pit is a Strength check, if you have Athletics proficiency add the proficiency bonus. Maybe you can explain why Acrobatics proficiency applies as well, but it still a Strength check. That's why you'll see many checks presented as Wisdom (Perception). The rules want you roll a Wisdom check, and add proficiency if have it for Perception.