(!1150) Reduce leveling up requirements for heroes by ~20%.

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Description

Reduce leveling up requirements for heroes by ~20% starting at level 5.

 

Checklist

I have:

• Tagged my change with the ;,; comment block.
• Ensured that this merge request changes exactly one thing.
• Attached the proper labels to this merge request.
• Added the Merge Request number in the title. e.g. (!42)
• Added a devlog entry for this change.
• Tested my code.