The most useful monster.

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Arandor;116632

looks more like a ranking of strong creatures than useful ones (or with cool combat skills))))
vampires are strong, but that's all... bone dragons with vampirism are much more useful if you consider that aspect)))
after all, angels with resurrection (when a hero-mage is killed in the final battle, but doesn't have time to drink a second healing potion) or cyclops that attack everyone, and those who cast slow and other spells are also useful.

The most useful is the Hero))) Sorry, I didn't know I had to vote for the top three, besides the vampire, I also like water elementals, they are cool guys, they can take down anyone, and Medusas. So, in the end:
1. Vampire
2. Water Elemental
3. Medusa

P.S. I also like Djinns, but since they can catch up with vampires, I'm not voting for them.