so the limeblooded trolls are all extinct. why?

UU: details of the genocide are historically mUrky. it’s one of those maddening voids in my Understanding of yoUr elaborate epic.
UU: bUt i have specUlated their extermination had to do with the extremely powerfUl abilities they tended to have, and the threat to aUthority they represented. even more so than other powerfUl lowbloods.