I can see the maps. Terrus' leap and Auraia's Step of the wind are 20 ft per psi point spent, and I can spend up to 5 psi points on an ability.
Second, I forgot it was evil badness instead of just Darkness. In that case, let's have them land outside of the darkness. They need to be close enough to "See' them through their tremorsense, so 3 psi points each should be enough to get to the edge of the field. They'll have Advantage, since they can see the guys, but the guys can't see them. There's a guy right on the edge, and that's who Terrus will hit. Who they all will hit, actually. That way, the Genasi don't go into the darkness.