The short answer is if you have to ask you probably shouldn't be in the section because you need to study more.
The site is full of non working spells put their by inexperienced users. Because of how busy the site admin is these spells linger for some time. This is why he created the Trick and Fantasy spell sections to put non working somewhere until he can delete them. Not all these spells are fluff but a good portion of then are. A spell that calls for an astral creatures guidance or protection would work [if you believe such creatures are real] but a spell to grow wings, transform, or do something humans cannot naturally do is a non working spell and no amount of focus, belief, energy, or deities will make it work.
I suggest you study more before looking through these sections so you don't waste time and energy on pointless ventures.