CrAbVampire is short for Creature Ability Vampire. It's the standard ability of any vampire.
If you wanted a crab vampire with spells, it can be done with a cloak spell (overpowered and doesn't connect with its attacks) a perk with a touch spell (not recommended in this case), a custom race with attacks set to cast that touch spell, or a mixture if you want to go nuts. I'm currently working on an update to my bosses mod which will include custom races and a mixture of all three of those techniques, and I can attest, they do work, and they can be pretty threatening.
The lore suggests that animals can become vampires. Along with the suggestions that have already been made, I would make the vampire mudcrab its own race and give it a unique texture.
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If you wanted a crab vampire with spells, it can be done with a cloak spell (overpowered and doesn't connect with its attacks) a perk with a touch spell (not recommended in this case), a custom race with attacks set to cast that touch spell, or a mixture if you want to go nuts. I'm currently working on an update to my bosses mod which will include custom races and a mixture of all three of those techniques, and I can attest, they do work, and they can be pretty threatening.