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Artanis could fall on the field of battle and come back as a colossus. Maybe even a robotic simulacrum of their old bodies to give an excuse for continual training of a unit that looks like Zeratul classic. What if the Protoss used the tech from the Spear of Adun to improve their resurrection tech and now have unique machines to place their heroes in? The immortals can be used for most warriors but special heroes like Zeratul or Artanis (if they die at any point) get their own special machines.
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In canon the Protoss already have a method of raising the dead (think Immortals or Dragoons) and Fenix has already been brought back from the dead. They already have the Mothership which is immensely powerful, can be reconstructed and which you can only train one of. The Protoss will be able to train heroes and revive them after deathIt would definitely fit in with the Protoss style of quality of quantity.
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