User blog comment:DancePowderer/Deus Ex Lacrima/@comment-4449950-20140209112406

Though I -like Jak and FTGM and the others- like it when limitations are set when it comes to Magic items and their uses, Lacrima hasn't made that much of an impact on the Fairy Tail story that I'm demanding an explanation.

From what I can tell, though it hasn't been directly stated, I get the feeling Lacrima are just containers constantly taking in Ethernano as Mages' bodies do, which can only be used so long as the Magic is still in them: i.e, if a Lacrima holds enough power for one attack, you get one attack, then it's just a rock again. It's an open idea, but the reason I don't complain is that I haven't seen anything in FT that really contradicts this idea or blow it waaaay out of proportion.

I guess that's why Lacrima doesn't concern me as a plot device: I see it just like I see a rechargeable battery in real life. I use it, it powers things and then it dies... I recharge it and repeat. On this note, I haven't seen Lacrima used in any way outside this; it always seems to be used as such. Even in Edolas the weapons and stuff died after being fired just once, almost a hint that the Lacrima was having trouble "recharging" due to the limited Magic power in the air.

So, as such (I have no idea what I've just typed, I'm kinda sleepy XD) unless Mashima suddenly makes Lacrima do something really stupid outside this battery-like use, I think I'll be fine with it being used whenever he sees fit.