Vans has only killed Gordan (the priest), one of the Heinz' party members who by that time had already left the party. I think he was called the green lance or something, he is your usual seaweed idiot who is full of himself, arrogant, etc... the dude who mandated her mother's death Thomas Palpek, you'll get know him after this coming arc and part of the nex after that one. Heinz and the rest minus the lance guy get to be A class and then S class adventurers. Heinz turns into a paladin of more acceptance for Dhampirs due to his regrets over killing Van's mother but he comes off as hypocritical and half harted because he still believes in Alda, the god who pretty much despises all the races created by Vida (dark elves, dhampirs, ghouls, etc). He even adopts a small dhampir girl. He encounters Van unknowingly during that time and well pretty much all his condescending hypocrisy triggers Van's dungeon creator abilities when he literally triggers Van. As of the latest chapters, his group already lost one more due to trying a super hard dungeon, which Van aces lol. And they are now unknowingly being trained to be heroes to fight against Van in another dungeon that is controlled by Alda. There they have infinite lives and pretty much no real threat of dying. So a training dungeon through and through. Ah how easy they have it.