another good combo for psy which i think its best is useing epiphany first then useing corruption(epiphany dont get dispelled so u can use corruption whereal epiphany delts some dmg too)and corruption delts a good damage if u got ur stat high
its easy to kill the baron.
just do what someone said in the early comment,DRAIN THE BARONS FOCUS!
just spam moves that will drain his focus and if ur usein a psy(what im usein)
when he uses Deep somethin to recover his mp,use dark eochoes so that his spell will delt FAR more damage
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