User blog comment:SsVivid/What I Learned From TMF/@comment-5049048-20140604181511/@comment-1962440-20140605004726

Th current theory, by my understanding, is that a god can be killed by anything that does enough damage. Elder Weapons reach this degree because they're just designed, unintentionally, to do so. They then also transfer the energy from the god to the newly-forged god more efficiently.

I think it's also believed that Silly-name was a Tier 2 god.