"Guardian -

The dangers we face ahead are indeed great; but, if there's one thing I'm sure of, it's that your will to overcome incredible odds is far greater.

The darkness is coming, Guardian. There is much we need to prepare, though I admit my own fears grow with each passing second. 

Eris Morn left you this - some sort of tuning device from beyond this plane. I've translated the inscription:"

In Darkness, there is Fear.

In Fear, there is Strength.

In Strength, there is Light.

When the Darkness swallows you, listen for that Light.

-Ikora Rey