I saw a video that recommended Dirge of Doom for bards, so I looked it up and am confused if it can actually be used effectively. It's a cantrip 3 with the focus trait, but only lasts one round. Since focus points don't come back until after a short rest, this seems to be of limited use most of the time. You can make enemies frightened 1 for one round. Based on this interpretation, this doesn't seem like it would be a good use of a feat and a focus spell.
However, as a cantrip, it also has the "at will" trait. So is the "at will" only as long as the focus points hold out/refresh or is it "as many times as you want", regardless of focus points?
If it's my original interpretation, I will probably not waste the feat on something with such limited usefulness. So, any clarification or advice would be helpful before I cast it in stone.