Frieren and Fern are the only magical girls that I care about.
Damn, I'm glad that I've read the relevant manga chapter a long time ago. I forgot about this arc and all its little wonders: screwing with the water so the Stille won't get near it, the battle junkie in Fern's party, and how amazing of a mage Fern has become. Why use more advanced spells, if the simpler ones are more reliable?