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Have you done the Forest Skulk Pledge quest? Speak with Dennison. If you've completed that quest then go speak with Micklin Vandus about the Plundered Tombs.

If the only quest you have completed is "Elissa Malna: Cargo Disk Lost!" then you need to go back to her and pick up the next quest "The Forest Skulk Menace". Level 20 and completed the Cargo Disk...