(This image isn’t from the mod, it’s from an Android game named Jetpack Knight. Just because.)
The Knight and Archers mod adds two new hostile NPC mobs to minecraft. It also adds a jet pack. Seriously. A minecraft jetpack, to go with the Knight and Archer theme, because when I think medieval combatants, I also immediately think jet packs. So do you. So does everyone. So basically, the premise of this mod is that there are basically six new highly powered mobs that will attack you more or less on sight, and to escape them, you have a jet pack. It’s pretty much the best and most coherent idea for a minecraft mod ever.