I just know my players are going to ask this - why isn't Gobspite being hit by lightning before he climbs up on the roof? For example, anytime in the last ten days, or while he's in the farmhouse (ie the house gets hit)...
Gobspite and lightning
One way to look at it is that any barn or farmhouse worth its salt is going to have a lightning rod (hay and lightning don't mix) ... so it could be getting hit, and when he is outside he is not staying in one place long enough to get nailed.
But you could also make a case the the azure wind doesn't interact well with the Waaaagh!!! and Mork and Gork?
Thats my best guess ...
Gully
I agree with GullyFoyle, I went with the lightning rod, but my players never asked about it anyways. The barn should definitly have one, and the lightning would strike the rod instead of Gobspite. But when Gobspite went up on the roof he got almost as high as the rod, and thus gets struck by lightning.
Plus, the effect is so comical and fitting that it should not be ignored.
(And when my players had to flee through the burning house, ohh that was great stuff and a near-death experience for some of them)
I made it clear to my players that the proximity of the two chunks of stoneThe Throne and the Brain Rockhad the effect of diverting lightning strikes away from gobspite. Of course, should gobspite ever get off the throne...