Razaketh was one of the demons holding Liliana’s contract and the immediate reason she had wanted Amonkhet included in the Gatewatch’s path. She had not explained the full risk. When the demon appeared, he controlled her through the agreement and turned her private campaign into an emergency for everyone nearby.
The Gatewatch helped create an opening. After Chandra's fire and Nissa's elemental wounded the demon, Gideon extended his invulnerability to protect Liliana while she recovered control. Liliana deliberately kept the Chain Veil unused. Instead she raised the drowned animals of the blood-filled Luxa, finally concentrating her power in two dozen dead crocodiles that consumed Razaketh. Jace pleaded with her to stop when the demon was already dead. Her triumph removed another master but unsettled her companions and exhausted the group shortly before Bolas's planned return.
Her friends recognised the manipulation. Liliana had relied on their oath while withholding information necessary for consent. They remained together because Naktamun’s crisis was larger than the breach between them, but the alliance entered its decisive battle with trust already damaged.