Adamantia's first requirement is to visit Old Thomas 5 times, and defeat the harpy. (Not sure if it spawns from Old Thomas or if we have to fish it out of a bush.) Reward - 3 rotten cabbages. I wasn't going to buy her until after I got all the energy droppers, but saw that Seeker's Coins are listed among her drops. Hope she isn't a "seeds and jewels 99%" fizzler.