Hmm. There's Sympathetic Adversary. Maybe they need the heart of the oldest tree in the forest and it turns out that's the home of the a nice dryad. The straight-forward method works for the nasty party but others may need a second meaning.
Puns/Double-entendres: Maybe the heart of the forest is a token of the dryad's love or the ring given to her by her long dead lover. Winning that could be an adventure of its own. Then there's the Mermaid's Tale, A Baby's Breath (a small white flower), tears of a slain king (know some good jokes?) Meet of the Orc Lord (A token of respect given to those that he grants an audience) Most of these work verbally and your group may not take to them. YMMV.
Those are more fantasy. Industrial you could do various obscure chemicals. Ice-8 from Everest after a lightning storm. Refined Puresilver only found in the temple ruins of your setting's dark continent. Make them gather the components for the Electro-Galvanic rod that they'll need to charge their item. Distilled essence of Pitchblend.
Of course, part of these are in the possession of bad guys. Part are lost and need investigating. One of them is a key component in the cities' defense grid. A couple need crafting.
And hit them with at least one literal. A Diamond in the Rough is an actual Diamond mixed in with Coal. Fake a notice check for it.
Then give them a real reflex save to see if they grab it before it goes into the engine.