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Pech These demi-humanoids spawn in magical biomes (including Taint, though the results aren't pretty). They come in several varieties -- most common are Foragers, but there are also Stalkers and Thaumaturges. They rush to pick up any loose items nearby, but they have a special lust for precious or magical items, and especially those with the Lucrum aspect. (It is rumored that the individual types also have other favorite aspects.)
The most common and dispensable items with Lucrum are often the golden armor from monster kills (and gold swords, once the Nether is in play). However, emeralds also serve well, advanced mages can use phials of Lucrum essentia, and any sort of mana beans will also be purchased (but are less valuable). Throwing a few such items (not mana beans) at a Pech will eventually "befriend" it, marked by green sparkles. Then the Pech can be right-clicked to open a "trading" interface. Offering another precious item and clicking the "dice" button will get you up to four items, which may be valuable or junk. (Note that items the Pech picked up will also be in the mix.) You can continue trading for several rounds, but eventually the Pech will just take the item and close the interface. You then will need to offer a few more "freebies" before the Pech will be willing to trade with you again.
"Valuable" items gained from Pech can include various magical trinkets (apprentice rings, vis amulets, and focus pouches, none very useful), silverwood or greatwood saplings, normal or enchanted golden apples, phials of Lucrum, native clusters of iron, gold, or cinnabar, and mana beans. Pech Thaumaturges can also give magical books, aspect shards or clusters, knowledge fragments, and the rare Pech's Curse wand focus.
Note that Pech are formally hostile monsters, and will commonly despawn if not properly tended. If their inventory is at least half full (five different types of items, none with Lucrum), they will not despawn, but a more reliable way to keep them around is to use a name tag on them.
You give them items that contain Lucrum, such as Silver Ingots/blocks and Gold Ingots/blocks/apples/armor. After you give them enough Lucrum, they'll trade with you. The more lucrum you give, the better stuff(on average), that you get but anything over 8 lucrum is a waste.
They can also be captured in a Safari net and auto-spawned for farming Mana beans. Not super efficient, but it works as alternative if your base it not near a magic biome.