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Where there's a need, there will be something to satisfy it.
"But why a seal? Wouldn't it be better to just wipe it out?" the fire dragon asked a new question. Generally, the main purpose of other intelligent creatures killing gods is to obtain things like Divine Blood, Divinity, and Godhead; to those beings, gods are basically walking resource depots.
Once they've dealt with the god, they can ascend to divinity, either by replacing the god they've killed or simply forging a new path to become a new god.
It isn't about preserving and sealing the defeated god. Wouldn't that just be asking for trouble? A god is still a god, after all. If you can kill them once, it doesn't mean you can do it again. According to the history recorded by the Dragon Tribe, many accounts of killing gods were filled with flukes.