I'll also agree to making these work with generic hags and then an underbar to talk about advanced ones for Mullonga.
I don't think the bash is a charge. It's pretty clear that it's a supernatural touch attack.
Need some kind of telepathy with their hag mistress, too.
Added to Homebrews.
We could give it a dive attack like we gave one of the tiny true dragons.
EDIT: Found this one...
Deadly Dive (Ex): When a crow's-nest dragon dives at least 30 feet and makes a successful bite attack at the end of the dive, it deals an extra 1d4 points of damage.
Telepathic link and "scry on familiar" sounds good. An arcane head might also count as a hag eye for similar purposes.
Should it have the Su flight ability, like this?
Flight (Su): An arcane head can fly at a speed of 50 feet. This supernatural flight also grants it a permanent feather fall effect (as the spell) with personal range.
That way, if it passes through an antimagic field, it will drift to the ground and lay helpless.
I wonder if I was too hasty about the telepathic link. This very well could be speak with master and/or empathic link. I still like scry on familiar, too.The only sounds made by an arcane head are low, pathetic moans and the grinding of sharp teeth. It appears they can communicate with Mullonga in some way, but they do not speak or otherwise talk to their victims.