This is all pretty subjective because one person may have one type of a feeling about this extract, and the other person may have completely different feelings.
For me personally, this simile creates a gloomy mood. The simile 'the hollow halo it was in was like an icy crystal cup' creates a gloomy and cold atmosphere in my opinion.
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Answer:
I missed hanging out with my friends because I had to study.
I had to miss an event because I was looking after someone younger.
Explanation: