Only elves and trolls had survived the coming of Man to the discworld ; the elves because they were altogether too clever by half , and the trollen folk because they were at least as good as humans at being nasty , spiteful and greedy .
Only elves and trolls had survived the coming of Man to the discworld ; the elves because they were altogether too dangerous by half, and the trollen folk because they were at least as good as humans at being nasty , spiteful and greedy .