Hmm. So, I like the idea of the Angel- I like what it's trying to do. I feel it may be tricky to achieve, though. Plus, even if it worked perfectly, as Madman points out, it takes a lot of lightning strikes to break crystal.
So... I'd be willing to go with Madman's idea, although I really think it needs a better description.
Tawjih Albarq (Channeled Lightning): Long have we sought control over the storm. So far has our knowledge advanced from those early days of flatulent breezes. But it is, of course, never enough. Tawjih Albarq is our latest attempt to gain ultimate power with which to smite the unbeliever.
Through Heretics' Downfall, we have gained some level of control over the path that lightning takes, granting it unparalleled accuracy. But still, lightning chooses its own way, follows its own path, even if we convince it to make its path one that favours us. Once the lightning has been coerced into striking, we abandon it to its journey. No longer shall this be the case.
Through the intonation of a prayer to God, the shepherd who guides all things, we create a microspell within the storm cloud, imbued with the caster's will, which gathers the lightning-in-potentia to it. When lightning is subsequently summoned forth, the microspell is pulled along for the ride by the wrathful elements. Having previously gathered together a greater 'charge', this lightning bolt shall be more powerful than average. In addition, the microspell races just ahead of the current, leaving a path in its wake for the lightning to follow. The microspell, of course, is imbued with its caster's will, and thus has no interest in anything but hated Arstotzkan crystal, which it shall seek out in preference of any other target.
The net effect is a more powerful, more focussed strike.
Bonus feature: Should we have the time, it has been hypothesised that at the end of its journey, the microspell could operate to transmute the electrical current flowing through it into a more
explosive phenomenon.
Close Air Superiority Ship Angel (1): Detoxicated
Tawjih Albarq: (1) NUKE9.13