Im assuming the fireball would destroy the coffin leaving a vampire in mist form nowhere to go.
It is not always the coffin, it can be the grave dirt, this way they can have multiple resting places. It can also be the crypt/tomb.
With the vampire lair effect of creeping fog, this may make it hard to follow the mist.
I like to be more specific with information on a vampire, it is not just any wooden stake, it is holly or oak or wild rose or all three, or made from a hang mans tree, etc. that way you don't get arrows as the fix-all (after tips are removed).
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