The extraordinary artist's giant brush.
It's as long as a person is tall, but no theme or subject material is too extreme once the brush is taken up.
Yet if the brush is wielded by someone who is not as talented, or if they are of sound mind, the resulting work will hardly graze the realm of the gods.
Should that be the case...
The only choice would be to obsess over painting like a madman.
The big paintbrush of an extraordinary artist.
Aside from the fact that it is as big as her body, if she swung it just once, she won't be able to choose any themes but the various universes.
However, she cannot handle it with a half-hearted efforts and sanity, she won't even be able to reach the level of an eccentric artist if she does so.
Well that is...
Unless you have such a strong attachment to painting that you would go crazy.