[Xedra Evolved] Fix Eater's sixth sense trait

[Standing-Storm]

Summary

Bugfixes "[Xedra Evolved] Fix Eater's sixth sense trait"

Purpose of change

The Eater Sixth Sense trait just gave you extra mana. That can't be intended based on #67898

Describe the solution

Change the trait to give you SIGHT_RANGE_NETHER, one square out per Eater spell you know.

Describe alternatives you've considered

Testing

Additional context