Wandering Villager

Picture this: you've found a village. It's 900 blocks away, across a ravine, through a swamp, and you've decided that today is the day you bring a librarian home. Four hours later you have built a minecart line of genuine engineering ambition, and your librarian has clipped through the rail, wandered into a hole, and drowned. You have no librarian. You have a very nice rail line to nowhere.

Or maybe you play on Peaceful, in which case the game's other route to a villager — curing a zombie villager — simply doesn't exist for you, because zombie villagers don't spawn. The economy is behind a door you were never given a key to.

Meanwhile, the Wandering Trader. Turns up unannounced. Two llamas in tow. Stands in your doorway. Sells you a bucket of tropical fish. Vanishes forty minutes later having contributed nothing to your life. He is, structurally, a villager who has simply refused to commit.

Wandering Villager gives you the means to change his mind. Craft a Settlement Contract from paper, an ink sac and a gold ingot, then use it on any Wandering Trader. He'll stop, consider his life choices, and over the next thirty seconds settle down — slowing to a halt in a cloud of green particles, to the same sound the golden apple makes when you cure a zombie villager. Then he's a villager. A real one, permanently.

He arrives unemployed, so the profession is entirely your call — drop a job site block in front of him and he'll take it up. His skin matches whatever biome you convinced him in, so a desert conversion gives you a desert villager. And his two llamas, suddenly unemployed themselves, are set loose as ordinary llamas for you to keep.

One catch, and it's the point: the conversion takes thirty seconds and it isn't instant or safe. If the trader dies before he's finished settling in, the contract dies with him. Bring a shield, stand between him and anything with teeth, and see him through it.