Final answer:
Van Helsing has added a holy water grenade to his bag of tricks to repel the undead.
Step-by-step explanation:
The new item that Van Helsing has added to his bag of tricks is a holy water grenade. This explosive device is filled with holy water, which is considered a powerful weapon against vampires and other undead creatures in vampire folklore. The holy water can burn and weaken vampires, making them easier to defeat. By using the holy water grenade, Van Helsing can increase his chances of successfully repelling the undead.
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