Thanks!
Swarms work best with two or more factions with cardboard in the clearing, so that even if you ‘overshoot’ and remove one, there’s going to be something you can score. Ruins are easy sources of points in non-vagabond games (LOTH can often be fought off and mobs removed). Easy points are also scored by squatting on sympathy tokens (although they hate haemorrhaging cards to the WA) or lightly defended cardboard like plots or tunnels.
Like LOTH, this is not a racing faction, but one that scores steadily and needs to slow enemies down. Overshooting and killing cardboard at least slows your enemies scoring down, so it’s not the end of the world Way more playtesting would be needed to stabilise the faction though!