8.5.0 Mythical Souls »« 8.3.0 Epic Souls
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Legendary sound way cooler than their name implies. These will guarantee either a 4* or 5* character in any class, or a specific class if it's a class specific legendary, and provide mythical fragments as well. Don't be too shocked if all you see from these is a 4*, as they keep the 5* at a fairly low drop rate so they really can be special when you find them.