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Adamant Beetle appears in the second half of the Arqa Block in Tartarus, from 41F onward. Since it is a lone Shadow in the battle area, it will appear as a smaller Shadow crawling along the floor.
In Golden, it appears on floors 7 through 10. It may also drop Fluorite for trade at Shiroku Pub. Selling five Safety Angles is enough to unlock the Tranquil Buddha accessory.