Red Leaf High

Also adding a couple things:

The Nurses in their stage CAN be killed, but only by Phantoms (Vol D'Ame can steal their invincibility, from what I understand). Familiars can hit them as well, with high-end ones like Cygnus and PB hitting hard enough to actually kill them.
For I/L, F/P, and Phantom, you can also just use Slow to practically immobilize them, not sure how well Bind/Crash/Doom skills work on them.

The Maple Weapons dropped are basically everything except Amethesian and all post-Legends classes. (i.e no Bowguns/Cannons/Canes/Soul Shooters/Fans/Katanas unless they actually updated the droplist this time)

IIRC, warriors can also Power Guard them, but I don't think it's possible to do enough to actually kill them that way.