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"Fiend pact warlock? No, you misheard- I took Pact of the Demon Core"
1d20 isn't that good of a damage die, even if it sounds scary because of its high maximum. Lots of smaller dice more reliably do higher damage, so I would have made it, say, 6d6 to make it sound more demonic too.
What makes it dangerous is the exhaustion also the 1D20 isnt its damage roll but its additional effect roll.