Out of the Abyss: New characters lvl 1 or existing characters no higher than 5?

Animated shield and bladesinging

Why is Extra Attack in the Attack Action?

Why is Extra Attack in the Attack Action definition, yet the only Action limited to “On your Turn” (Reserved for non-Actions)..?

I was trying to understand why it doesn’t work with Ready Action – while AoO isn’t the attack action.

Are there any books you’d recommendabout Feywild?