Helping Erandur battle through Nightcaller Temple in search of the Skull of Corruption, the Dragonborn is blocked by Veren and Thorek, who label Erandur, a former priest of Vaermina, a "traitor." He immediately becomes hostile and attacks the two on sight.
- Waking Nightmare
"And what about you, Brother Casimir? Are you prepared to serve the will of Vaermina?"
- I've made my peace. I'm ready. "Then it's decided. Brother Casimir, you must activate the barrier and release the Miasma. Let nothing stop you."
Thorek: "The orcs have breached the inner sanctum, Brother Veren."
Veren Duleri: "We must hold. We can't allow the Skull to fall into their hands."
Thorek: "But... no more than a handful of us remain, brother."
Veren Duleri: "Then we have no choice. The Miasma must be released."
Thorek: "The Miasma? But, brother..."
Veren Duleri: "We have no alternative. It's the will of Vaermina."
[After speaking to "Casimir"]
Veren Duleri: "Brother Thorek, we must remain here and guard this Skull with our lives if necessary."
Thorek: "Agreed. To the death."
Veren Duleri: "Then let it be done. Farewell, my brothers!"
Erandur: "Wait... Veren... Thorek... you're alive!"
Veren Duleri: "No thanks to you, Casimir."
Erandur: "I no longer use that name. I'm Erandur, Priest of Mara."
Veren Duleri: "You're a traitor. You left us to die and then ran before the Miasma took you."
Erandur: "No. I... I was scared. I wasn't ready to sleep."
Veren Duleri: "Enough of your lies! I can't allow you to destroy the Skull, Priest of Mara."
Erandur: "Then you leave me no choice!"
- Because Veren is hostile and must be fought, he is a useful candidate for the Dunmer blood needed to help Septimus Signus open the Dwarven Mechanism in the quest "Discerning the Transmundane."
- Although Erandur claims that "the Miasma" damages the minds of those under its influence, rendering them insane, Veren displays none of the behavior of the Orcs and Vaermina devotees inside the temple.