I've been using this mod ever since PilzAdam was so kind as to post it. And it is AMAZING. One of my complaints with the basic minetest_game has always been that there were no "mobs", no enemy monsters to attack. But when I installed the Air Sword, I found out to my extreme joy that it automatically turns on the built in aerial mobs for the minetest_game!!! These mobs only attack when it is PITCH BLACK, which makes them even more frightening and dangerous.
Just the other evening, I was wandering through a dark cavern at about -500 level, looking for diamonds and mese, when I accidentally stepped off a ledge and fell down half a dozen nodes. The fall was not enough to kill me, but my heart started pounding fast as soon as I realized that I had fallen past the light radius of my last torch. I was in the dark, and the inky blackness around me was crawling with hostile aerial mobs!
Thank goodness for the Air Sword!!! I clicked mightily with it, and at every click an enemy mob died on its windy edge. I kept clicking and slaughtering the evil hoards until I finally made my way back into the blessed light of a lava lake, which (thank goodness!) banished the evil fiends. If it hadn't been for my trusty air sword, I never would have made it back alive.
I have read some complaints about the AI of the lua mobs being clumsy and slowing down minetest. But the aerial mobs tracked me with a tenacious accuracy, and despite being surrounded by dozens of them, I noticed NO lag in the game whatsoever. Perhaps it is the wonderful invisible texture they are painted with that makes them so much more efficient than the other kinds of mobs?
I find it fascinating that these mobs are built in, but can only be activated by some strange event like adding the air sword mob. I wonder if there is anything else that could turn them on? So, if you are wandering around in minetest, and somehow end up lost in the dark, you would do well to proceed with caution. Stop and contemplate the darkness around you carefully. You can't see them, and you can't hear them, but they MIGHT be there, aerial mobs, all around you, closing in on your location at that very moment. And if they are, you had better hope you have an Air Sword handy...