Okay, so I'm writing a novel/running a game/working out backstory for my world. The original vampire was defeated at some point by a holy warrior who initially specialised in underwater combat against merfolk in enchanted full plate (it was designed for underwater combat). Now, he may or may not have help from a dragon. Albeit a wingless one (just the way they are in the setting). My problem is I don't know how the vampire could be killed. There's the possibility that it can be revived in a very unique way somewhere down the line, but the only important bit about that is that her spirit is still hanging around somewhere. Basically, she can't have been trapped or anything, she needs to have been destroyed. Unfortunately, I've given her a huge amount of power(s), which I will list below. Could you elegan/tg/entlemen help me devise a way in which she could be destroyed during a combat within what's essentially a roman bathhouse?
Her powers are as follows:
Immortality, darkness physiology, disease immunity, soulless
Enhanced: Agility, combat, durability, endurance, senses, night vision, speed, strength, healing
Abilities: Curses, Blood Solidification, Blood Armour, Darkness Manipulation, Emotion Consumption, Illusion Manipulation, Heamopotent Replication, Fangs, Claws, Prehensile Tongue, Command over Vermin, Wing Manifestation, Presence
Mage: Illusions, telekinesis, Empathy, Destruction, Entropic, Mind Control (and hypnosis), Necromancy, Shapeshifting
Weaknesses:
Direct Sunlight - Merely Weakens
Running Water - Cannot Cross
Powerful Holy Fire/Water - Prevents healing