Board Thread:Questions and Answers/@comment-7737174-20130402211149/@comment-4867780-20150830100656

"Creator" isn't a being in Umineko, it's a term describing the highest level of power/existence, the point where you completely lose all limitations (interesting divergence : for once it's not about "gaining" power, but rather "losing" limits).

As it turns out, limitation happen to be self-defining as well (the separation between what you "are" and "aren't"), so losing all restrictions essentially amounts to ceasing to exist, as explained in "Lamdadelta's Diary". Featherine is simply the only being who reached this ultimate level and "survived" the experience ("the one who touched the higest, forbiden heights and survived", as explained in the visual novel).

But once again, considering she's essentially the in-universe writen of the Umineko series, everything (and "words of god" in particular) is ultimately to take with a bit of salt ^ ^;