Well, we could attempt to reconstruct it from history and similar landempires. We could take babylonian or russian history and transpose it into the language. Then recreate some superiority atrocity justification mythology ("gods chosen people"/"sinners-born-unpure"-must be purged.) Then we take all the tribes that sided with the spaniards, whose history they wiped out and invent some colorful horror-stories that other them. So, the spaniards of the new world getting trampeled by the old world, who brought gonorreha home,creating hyper puritan std ethics, voila.. nothing of value was lost.