Board Thread:General Discussion/@comment-27136653-20160926150813/@comment-27701762-20161001195939

Tsskyx wrote:

and the only place magic can naturally be found in is in monster souls. Here is the error. While we only observe monsters using magic, they are not the only beings capable of using magic. The Barrier was created in the first place by humanity's seven most powerful magicians, meaning that humans at one point (or perhaps even currently within the game's world) have access to magical powers.

One can extend that logic even further: all living beings - or at the very least monsters, humans, and plants - have a theoretical capability to use magic, but only some can actually manifest it in some way. The actual mechanism to explain how beings tap into that magic power is never provided.

A secondary theory begins as such: Flowey's power to manipulate magic comes from the essence of Asriel that he absorbed. As an normal flower this essence would not mean anything, but upon being made conscious through the determination injection Flowey is now able to manipulate magic provided through his link to Asriel.