What says you? Creature consistency in games/stories...
Oh, they can be mixed matched and jumbled all they like! Drop in some dragons with my gorgons with my egyptian gods for all I care.
Maybe some crossovers is ok, but it should be mostly kept to one theme.
If the crossovers can be compatible, then go for it. Dragons might work in Greek Myths, but not so much with vampires and werewolves...
One theme only... mixing fantasies is like mixing alcohol. Sometimes it might work, but for the most part, it just tastes like bad mouthwash.
Hmm... never thought about it...
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