I realize you can farm Koto for the Ninja Pig spell, but does anyone know which of the non-boss pigs found across Mooshu also drops the spell? I learned the spell that way on two of my wizards, but it was awhile back, and I don't remember where I farmed it.
The only bosses who drop Ninja Pigs are Koto and Loremaster, but you can also craft it or get it from a pack. Only bosses can drop spells whereas simple street mobs and minions can't.
That is not true. Ninja Pig spell does indeed drop from street mobs in Mooshu. My fire and my myth farmed them to get it. I also had a friend who farmed there as well, but now we don't remember which ones we farmed. It is also possible KI changed this, as it has been several years ago.
Mental is correct. Ninja Pigs do indeed drop from certain street mobs (the ones that look like Ninja Pigs) in Mooshu, as I learned in there on my myth wizard. I haven't farmed it recently however, and have no clue if it's changed or not.