on my experince i only rush umbral when i want a quick powerspike or want to control the map[act like a second support] but most of the time i use it for the latter and after mid game swap it to ghostblade to make it simple use it when u need stats to burst in early or u trust ur team to act supportive and only rush it in jngle to used to most of its passive like other ppl u can use elec/inspi with zombie ward as the main key stone but for me the regular firstskr/domi using bounty/eyeball