>Tell players it's a point of light setting and pic related at the main races
>Other races exist but are rare
>Make it clear they can play whatever race they want as long as it doesn't have flying
>Even have a plot hook in case they play something freakshit
>Nobody plays freak shit
>2 humans, a dwarf, and a gnome
I guess telling people they can play freakshit but it's rare is enough to put people off. I really didn't mind what races people played I just don't want to have to pick from a laundry list of freakshit races for my NPCs.