If you are going to write a short story, you don't need to make things up entirely.
You should always use as much creativity as you can, but you can also take elements from real life and incorporate it in your story.
Answer
extreme greed for wealth or material gain. "he was rich beyond the dreams of avarice
Explanation:
av·a·rice
/ˈavərəs/
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noun
noun: avarice