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[[Deckard Cain]] is a NPC found in all five acts of Diablo II. He provides identification of items (for free, to characters who rescued him in Act One; for 100 gold per item for characters who did not rescue him on that difficulty level) and lectures forth a great deal of plot information and game lore. He is found in a central location in all five towns, and is conveniently near the stash in the first four towns.

Cain fulfilled the same role in ''Diablo'', where he became known for his loquacious nature and rambling, overlong stories. This tendency of his was used as something of a joke in ''Diablo II'' and the fact that he was caged and tortured by the demons in Act One was something of a fan service for long-suffering ''Diablo'' fans, who after endlessly clicking through his stories in the first game had often wanted to stick him in a cage themselves. His usual verbal prompt in ''Diablo II'' is "Stay a while and listen." in homage to his wordy nature.