Also, try reading the account of historians of the period and compare the description of brutality - mountains of skulls, 100,000 infidels (taken as slaves) put

Also, try reading the account of historians of the period and compare the description of brutality - mountains of skulls, 100,000 infidels (taken as slaves) put to death overnight, etc. with the description in your favorite history text which probably says "Timur ransacked Delhi".