[406] Watcher arm damage reduced vs Fortresses.

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Description

What does this merge request do?

 

Changelog

General
- The users need to know that Unit X now has 500 health

 

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)
• Tested my code.