It's a skill given to knight by a tech which would be devastating for infantry and cavalry, but not outright kill them, I guess.
The skill would be a one time use, like make it have a 100 turn cooldown or they can only be replenished by the suggested field blacksmith or when they go back to stables.
I know we already have a lancer unit but that's a throwing javelin is thepurpose of the skirmishers right?