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This makes most of the traders invulnerable to dying. As you might know, when you edit the trader files, to make him sell stuff cheap or for free,he usually dies when you buy a bunch of stuff off him at once. Or even if you buy 1 or two items, This makes most of the traders invulnerable to dying. When you sell a trader lots of your loot, he is prone to dying, probably because of shock at paying out all that money.