The Blood Curse

 is a quest in The Witcher 2: Assassins of Kings.

After Vergen
To lift the curse go to the site of the execution. You'll need to direct Henselt when he's drawing runes. Use the diagram from Dethmold's Grimoire and overlay it onto the site. If the king starts at the pixie ring, he should follow the following sequence: sour milk, raven’s corpse, scorched tree, goat's skull, black candles, petrified bread, pixie ring again. If the sequence does not work, try to reverse it.

Journal Entry
At that time, King Henselt suffered from an embarrassing affliction. Namely, he had been cursed by the Sorceress Sabrina Glevessig, whom he had executed for making a grave error in her magical practice. Witcher are experts on curses and can generally figure out how to lift them, but even they need pointers sometimes. Geralt headed for the site of the stake at which Sabrina has been burned. To lift the curse, he needed to learn exactly how the execution played out. Then, he would need to recreate it using the very items that had been used during that event. After examining the tracks around Sabrins' execution site, the witcher had many questions and preciously few answers. Geralt decided that the soldiers keeping vigil at the circle could be a good source of information and began to question them.

Geralt followed the trail like a hound from royal kennels, and pursued the solution. When it turned out that the inspired, a man fascinated with the sorceress who met an ill fate, lives in the hills east of the camp, the witcher felt he'll surely learn something the king couldn't tell him there.

At Sabrina's pyre, Geralt indeed met the two soldiers Zyvik had mentioned - badly terrified, but both in one piece. More importantly, however, he examined clues and and discovered that the sorceress' remains were in high demand. According to the soldiers, a relic vendor peddling his wares by the canteen had been gathering bits from around the stake. That's right - the deceased sorceress had already become the object of worship.

Having heard about the Visionary and the relic vendor, Geralt had to decide whom to head to first.

Asked about saint Sabrina, the vendor grumbled something about it being the Visionary obsession. Thus, willing or not, Geralt had to head for the hermit's house. The witcher finally managed to fulfill all of the Visionary demands. The Hermit agreed to talk about Sabrina Glevessig, her martyrdom and the events following her execution.

It turned out that the merciful soldier present at the sorceress' execution had prematurely ended the tortured soul's suffering. That event changed him: he deserted and started preaching Glevessig's sanctity. The spear he had uses to pierce Sabrina's side, as a powerful item, was quintessential. The witcher had to acquire it and, since he'd found a great source of information about the sorceress' cult, he decided to drink his fill from the wellspring of knowledge.

According to the Visionary, the relic vendor now owned the spear. Geralt headed for the canteen, where the man peddled his wares.

The relic vendor danced around the subject like a true master. As a businessman, he did not want his secret to go for free.

And nothing. The spear was in the hands of Iorveth, thus in Vergen, the town beyond the ghastly mist. The way through the battlefield was mortally perilous, even for a witcher. However a man who had already proven his ability to protect others from the curses evil aura made camp at king's side. It was the sorcerer Dethmold.

Henselt's advisor told Geralt how to get through the ghastly battlefield. Equipped with an amulet to repel wraiths and a white flag for playing envoy, Geralt went through the mist towards Vergen. He hoped to find Iorveth, since according to the relic vendor the Scoia'tael leader was the current owner of Yahon's spear.

The Witcher took Zoltan along the way,a nd the two of them entered the wraiths' mists, the very heart of the ghosts' battle. If not for Dethmold's gift, who knows, maybe they would have stayed there forever? Surrounded by wraiths, they trudged toward Veregn, following the amulet's direction.

Bugs
Occasionally, the game crashes to desktop after speaking with Henselt in his tent. Meditating till midnight fixes it.