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One of my gripes with the games was the fact, that normal companions stopped levelling with you, I think at 20. So I simply wasn't able to solo as I wished. I know they had placeholders for Companion training books. Did they finally add them? Or give an ETA for it?
Thanks.
People don't ask questions to get answers - they ask questions to show how smart they are. - Dogbert
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Normal ones stopped at lvl15. There are no training books, they've made an easier solution, since Feywild you can upgrade them (for a hefty price of course) right from the Companion tab, with the very same button with which you send them to level up.
I think there was even a post on the forum when a n00b accidentally upgraded one (actually I don't know how, there's an extra Ok needed before it charges your AD balance)
So the short answer is yep, you can upgrade your companions now.