Evil playthroughs have often been made an afterthought even in very good CRPGs. To me it seems like Larian has invested in fleshing out features for various kinds of evil playthroughs (factions, dark urge, illithid powers). It also seems like they've made principled roleplay demanding (thinking of oath of devotion mechanics here). Gotta say, in this larger, in fact genre-spanning context I appreciate what they're doing. The dark urge is not so tempting to me (it leashes you to Larian's idea of edginess, which who knows, maybe includes urges to consort with bears and whatnot), but this other mechanic sounds like a lot of fun. Hunting down tadpoles, assassination - smidge of a bhaalspawn feeling even - and a few extra build options.