To imprisson an old god is another matter ofcourse and well to kill one old god and imprisson the rest one (1) Titan fell.. and it does not even say if it died or just went out of a combatative state.
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Blizzars has made the titans the most powerfull beings in the universe, they create planets with their powers, they create order. The fallen Titan has the power to corrupt entire species and boost their powers to the unimagiable. (Kil'jaeden and archimonde to name a few)