“Nightfall Sanctum Discovered” is part of the achievement “Leave no Treasure Behind” which is part of the Meta Achievement “Glory of the Delver”. Completing this meta achievement rewards the mount Ivory Goliathus. Completing the Achievement “Leave no Treasure Behind” rewards the Title “Seeker of Loot”.
https://www.wowsaga.com/exclusive-content/all-sturdy-chests-in-earthcrawl-mines-1
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