This score will be based on how many kills you achieved on the bosses.
Each kill is worth:
Atheon - 35 Points
Crota - 15 Points
Oryx - 50 Points
Go ahead and add up your totals.
For example, here's mine.
Atheon - 105*35 = 3,675
Crota - 256*15 = 3,840
Oryx - 174*50 = 8,700
Total = 16,215
~[i]TheGreatNike[/i]
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Over 9000000000