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Frost Giants Get The Casket Of Ancient Winters

Hard match to call because we don't have too many feats for frost giants. But the fact that they're able to match up against Asgardians and their ice weapons can injure and kill Asgardians makes me put them above the Warcraft Orcs and humans.

So Frost giants for now till someone else comes up with a more convincing strategy for the Orcs and humans.

Too many unknown factors here. Warcraft also had Elves, Dwarves etc. but we only see the Humans and Orcs in action, so we don't know how powerful the other factions are. They also had a bunch of magic users, but we only see 3 of them operate, in total.