As in title, all War Beast enemies cannot be targeted by the Arc Conductor Ergo Sum's radius shock effect.
This includes Cabal War Beasts, Shadow Legion War Beasts, Shadow War Beasts ("Taken" War Beasts), etc.
This issue does not affect Riskrunner's Superconductor chain lightning perk.
Video attached of one example.
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Hey there, Thank you for reporting. We'll pass this along to the developers for investigation.