why during cutscene its always like this ... (small spoiler)

[dinnertime]

And also previously with Nabriales, our character didn't even posses enough power to destroy him without Moenbryda's sacrifice. As the story progressed we gained an even stronger version of the Blessing of Light, and grew even more powerful than Thordan; An ideology supplemented with generations of worship and fervent prayer. The echo is a very strong device, and has been acknowledge as our strongest weapon of choice.

How can you honestly sit there and say that your character wouldn't use the echo, when he has used in so many times in the past.

The aetheric lightsword/beam wasn't even the Echo or Blessing's doing, but an abundant source of aether you had at the time. You defeated Nabriales using Tupsimati and Igeyorhm with Nidhogg's eye.