Trained Gromit Carrier

Trained Gromit Carrier can be purchased from Archivist Roh-Suir for 35 Cataloged Research at the Reliquary of Remembrance in Keeper's Respite on Korthia. Use it to summon a friendly Swagsnout Gromit, which will occasionally stop what it's doing, grow quite large, then run in the direction of a treasure or dig something up:

If it finds a treasure, it will make the treasure glow obviously for 10-15 seconds or so.

The item is not consumed on use, and can be reused indefinitely.