Amaranthar in the comment thread on the last post referred to “rares” in Ultima Online as a feature. They weren’t really, though. They were a bug.

First, a definition of rares. These were simply items that were incredibly uncommon. Often they were near unique. They couldn’t be found via loot  — they were only spawned once, really, when the server came up. As a result, they were immediately collectible. Most of them had no use whatsoever — they were simply uniquely colored objects, like a red vase that a crafter couldn’t replicate, or an object that was outright not craftable at all. A few were obvious bugs, like “water tiles” — a literal patch of water that you could pick up and stuff in your backpack, which because of how the simulation layer behind UO worked, actually functioned as water. You could fish in it, or pull a jug of water for cooking from it.

Needless to say, collectibility alone was sufficient to drive these to have immense value in UO’s economy, which was largely player-driven. Rares began to show up on eBay going for substantial dollar amounts, sometimes in the hundreds.

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