The other being an elite ant psyker unit. Cost 8 hp 20 armour 1/0 move 3 Range 5 damage 1 actions 3. Channels the sheer will of the hive into distant targets to deal accurate strikes that can be very dangerous with enough supporting ants.
I am sceptical only about one thing - I'm not sure if psionic should be capable of damaging. I always considered it the control of the minds and thoughts, not the physical world. Although using heart of swarm to scale the damage of a range, many actions unit that without it is not great seems like a great way to facilitate on that unique to insectoid buff.