The psyker battle squad functions like a chorus of psykers, working together to put out a powerful psychic blast. Run a full squad, in a chimera, and let them do their magic out of the hatch. The overseer, while alive, murders psykers instead of letting the squad succumb to perils of the warp. If the overseer is dead, the entire squad suffers perils together (bad juju).
The most effective way I've seen them run, like I said, is a full squad (9 + 1 Overseer) in a Chimera.
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