Dots + catharsis.
But also just playing normal void form vs dark ascension. Basically never cast and wait for procs.
Spam purge instead and generate insanity with that. While also removing helpful effects from the enemy.
If you know you’re gonna be trained maybe drop psyfiend for driven into madness. Look for stun > silence combos on healers. Maybe a fear if you can position for it.
Keeping up dots, devouring plague procs/never cap out insanity. Catharsis, Driven to Madness when being trained help a lot.
Psychic link and having Void Form over Dark Ascension if you’re being trained because void bolt works into psychic link too, otherwise it’s a lot of spending procs.
If you want to see it in action and see what higher rated spriests are actually doing have a full video.
Damnation
Instant VT follow up
Instant shadowfiend
PI and instant void eruption with insatnt void volleys
Insta stun healer in to an insta silence
Get fear off if you can with fade
Void bolt off CD, instant mind blast and mind spike procs
If you wanna get cheeky try to get a games off but mostly just keep spamming instants