Lord/Map Events Mechanic

What unexplored map/lord mechanic has FS not touched at but could be quite nice to face

For Example:

Kill-zone: Snipers (Skaven Jezzail for Vt) having small overture where they will try to shoot the PC and/or a bigger zone but they need to adjust the shot (leaving you some time to evade/get out)

Armoured/Plated Enemy: Enemy that can’t be defeated/damaged via regular mean, instead you can use mechanized apparatus to deal damage or break armour (Tanks for Darktide, stolen Steam Tank for Vermintide 2)