Auto-translated
I've made a version for Singleplayer and Multiplayer. In Multiplayer, I removed the Aura and slightly weakened the Banshees; in Singleplayer, I weakened the Banshees' Wail and slightly reduced their stats.
As for the Messengers, I don't see the point in weakening them for Singleplayer; they're already weak.
Right now, we're talking specifically about the Banshees.
I'll upload both mods here now. It's time to create a new thread...