Nargl’frob’s Empyrean Spear

What's it called? Nargl’frob’s Empyrean Spear (in short, NES).

What does it do? Well, what can one say about NES? This is the famous lightning spell. It will invoke a ray of pure plasma from out of the sky with which to burn one of your oponents to ashes. That's basically it.

It tends to be quite a popular spell, as the amount of damage it does (quite variable nevertheless; see notes) is quite high, and it affects trolls. The handicaps, though, are quite a few: big gp expenditure, can only be cast outdoors, the component it employs is quite heavy and hard to carry massively, it is slow in the casting and (if you aren't careful to stop holding pointy weapons), it can do you horrible backfires, and even kill you.
Overall, I'd say this spell is a must for any wizard (more so if you're of the Circle persuasion), but I tend not to use it much myself, mainly because I don't have enough torches on me, or because I'm indoors. Being an individual ofensive spell makes it specially useful for the kind of tough, solitary buggers one finds on top of Djelibeybi walls, and such...

Where is it? Well, being about modifying the climate a bit to come to your help, it only befits it to be at the Weather Magick grimoire, at the Unseen University Library.

What does it require? A torch, which is consumed in the process.

What skills do I need? Water, Air, Fire, Earth, Evoking

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

You prepare to cast Nargl'frob's Empyrean Spear on xxx.
You think of a dark damp cave.
You dream of bats.
You hurl the torch straight up into the air.
You wiggle your toes to get a good ground.
You loudly exclaim: Let there be light!
A bolt of lighting arrives from above, washes through your body and leaps off towards xxx.
The bolt *** (see notes).

Help Information:

Nargl'frob's Empyrean Spear - Zap something with lightning.

Nargl'frob's Empyrean Spear is a first order offensive spell that involves poly-elemental (weather) magic to summon and direct a bolt of lightning at your target.

Notes:

The spell produces a variable amount of damage that can be guessed at depending on the last line after casting and hitting the victims. The chart is as follows (thanks for it, Sekiri!):

The bolt misses more or less (0-37 hps)
The bolt causes their hair to stand on end (37-225 hps)
The bolt sizzles around them (225-600 hps)
The target is surrounded in hazy blue light and you smell burning flesh (600-900 hps)
Blue light streams from every pore on their body (900-1275 hps)
The bolt smashes into them. Greasy smoke curls away from their feet (1275-1650 hps)
The bolt burns a hole straight through them. You can see right through (1650+ hps)