A walkthrough of the challenge "Psionic Assault". This strategy is what worked best for me. It's not perfect, but it gets the gold achievement with plenty of cushion (for the pushin). Feel free to tweak it to your liking, and let me know what works best for you.
Hallucinations and archons weren't really used, but it doesn't mean they can't be useful. The simplest gold for me was pure psystorm/forcefield
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