How to get more rage to fill up the meter?

[monitor]

I have killed four Valkyries but my rage is low. How do I fill up the rage meter? Some mentioned about killing more monsters but many places I have visited don't have monsters anymore as I have killed them all.

[Jahellson]

- There is a talisman that increases part of the rage bar when used (Q+E);
- The squirrel summoned by Atreus can also be used for this purpose, as long as you have the lightning arrows (yellow).