fix: change log level to debug and improve message

[omarcopires]

Description

The log level has been updated from warning to debug to reduce the verbosity of error messages and improve the debugging process during production. Additionally, the log message has been refined to offer clearer and more actionable information. It now specifically indicates when a boss's corpse is missing or not found, including the exact position where the issue occurred.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I checked the PR checks reports
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works