El Shaddai is a title applied to YHVH in the Hebrew Bible and Christian Old Testament, and is traditionally translated into English as "God Almighty." Jewish tradition states that it means "God who said 'enough.'" Other meanings such as "god of the mountains" or "god of breasts" (i.e. fertility god) have been proposed in modern scholarship.
Shaddai is an avatar of YHVH, found in the Ark. Upon encountering Aleph on the Ark, it calls his very existence blasphemous as an artificial life and attacks.