Dave and Terezi do a shitty sidequest and experience the Dark Nak of their Soul.

“Maybe we could just – not talk. Until the effect wears off.” “It shouldn’t be that hard,” Lan Xichen said encouragingly. “Given that it’s us.” “What’s that supposed to mean?” Nie Mingjue asked suspiciously. “Well, it’s not like the three of us ever talk anymore,” he said, and then slapped his hand over his mouth. Jin Guangyao could not wait for the truth-compelling effects of the smoke to wear off.

What sort of servitude ceremony was this? — In which Shang Qinghua didn't leave.

“What’s got you so jumpy, hero?” Dabi sneers, and Hawks answers him. “I got hit with a truth Quirk.” Hawks swiftly contemplates every decision that has gotten him to this moment, starting with his own birth, and regrets all of them. Dabi’s eyes light up like it’s Christmas Day and Hawks is the present he’s been waiting all year to unwrap. “Really?” He purrs, “Well, isn’t that incredible.” ~~~ Hawks gets hit with a truth quirk right before a meeting with Dabi. Dabi thinks it'll be fun. It isn't.