Yes, that was a typo. I meant 4th level.
I think a SoD spell, like phantasmal killer, would just be a waste of time. I think a no save or at worst a save for half would be the only way to go.
I like Enervation, but it would be hard to kill with it.
I was thinking like an intensified empowered magic missile or ear piercing scream.
Magic Missile has no save as well as no miss. But stopped by a simple shield spell (which have been kinda common in the campaign so far).
Ear Piercing Scream has a save, but almost nothing resists sonic damage.
I hadn't thought of Vampiric Touch, but that would fit for the concept and has no save.
Hellmouth Lash might be amusing and also has no save.
I think I will leave it as a normal charged wand. The number of charges will depend upon when/if they get it.
I'm ruling that they can understand and be understood in the dialect. The question was specifically sounding like a local.
I can sorta see any of them (hadn't considered disguise).
Learning several languages does seem to help people sound more like a native. I would assume the additional practice at making more different sounding word noises helps. When people do learn to disguise themselves, I would think they would also have to practice with the voice. I can see pretending to be a local as a bluff check.
I think what I will do is up the DC a little beyond what I was thinking to maybe 17, but they can chose any of the 3 skills to use.