Pragi's Fiery Gaze

What's it called? Pragi's Fiery Gaze (in brief, PFG)

What does it do? It creates from an eye a ball of fire that roars and burns everyone in a room. That's it. It sounds straight-away and simple, but don't let that fool you: this is the best and most important spell in the Disc for any wizard.
So, why is it so valuable? Well, the amount of damage it does, with decent skills, is quite good (see notes). Its component is near-inexhaustible, meaning you'll be able to cast the spell continuously as long as you have a knife and fresh kills; its gp expenditure (40) is quite reasonable; and it seems to tm incredibly well (although this might be a result of it being the most frequently cast spell there is).
Setbacks? It doesn't have many. Probably the worst is that it does very little or no damage to 'rocky' and similar life forms. Some would complain that, being a room spell, it hits *everything* in a room, including things that casually wonder in. This makes it unconfortable in some places.
All in all, my favourite spell and one you are probably employing as much as I am...

Where is it? Well, as its mechanism is turning a ripped eyeball into a fireball, it fittingly belongs to the Ae Thouesand and Onne Thyngs ae Boye cann Do with Corpse Partes grimoire, at the Unseen University Library.

What does it require? An eye.

What skills do I need? Evoking, Channeling, Enchanting, Animating, Fire

Has it worked? The proper output should read something like this:

You prepare to cast Pragi's Fiery Gaze.
You lazily close your hand around the eye.
You poke your tongue out at the world.
You struggle to hold your hand closed as red sparks shoot out from between your fingers.
You let go of the eye. It hovers above your hand.
The eye ignites and a small ball of fire forms above your hand.
You move your hand and the ball of fire zooms out into the inmediate vicinity and sweeps over everything.
The fire xxx (see notes).
The fire dies away.

Help Information:

Pragi's Fiery Gaze - Great balls of fire.

Pragi's Fiery Gaze is a first order offensive spell that forms a ball of fire from an eye, washing the fire around the area to burn things.

Notes:

Like the other so-called Pragi clones, the damage that you have done to your oponents with this spell can be determined from the outputs you get while casting about how badly your rivals have been 'burned'. We have the following possibilities of percentage damage (in relation to victim's top hps):

The fire singes the xxx (0-15%)
The fire burns the xxx (15-35%)
The fire crisps the xxx (35-55%)
The fire melts the xxx (55-75%)
The fire incinerates the xxx (75-90%)
The fire vaporises the xxx (90+%)