u/FBLD5

I’m trying to think of a story set far in the past with a character who is half drow and half wood elf. I don’t know when Wood Elves actually became their own sub race tho. I know they came from green elves sometime between -9000 and -4700 but I’d really like a more precise estimate so I can really push back the time period the story takes place.
I guess it would also be important that drow at the time are even capable of capturing a wood elf and bringing them back down to the underdark as a slave.
Any suggestions or ideas?