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By Anonymous
#16378088
Pretty sure you get this for defeating Avatar of Thalamus the first time.
By Anonymous
#16391793
I lost this because I had no inventory space and jumped immediately into the cutscene, teleporting me to another location.

TBF they let you pick it up before interacting with Thalamus and triggering the cutscene, but I was mashing the buttons and lost the chance. RIP