I'd like to get the Arcane Echoes, but it doesn't light up on my ED tree. In fact, none of the Echoes seem to be available.

So I wonder if it is bugged or if I am missing something.

I'm in my 5th tier of Fatesinger (already have Turn the Tide) so I should be high enough level to get it. The only prereq listed is "bard lvl 20", which I am. I have one ED point available and it says it costs one point.

A little help, please?