User blog comment:Mineko Charat Lucky/Touhou LoL - Youmu, the Half-Ghost Landscaper/@comment-5157639-20130121222100/@comment-5791947-20130122045911

Thanks for the feedback. She'll drop hard if she doesn't build AD though. She's like the melee AD version of, all her spells scale on bonus AD, meaning she won't do any damage without large amounts of AD.

That 3.9 scaling exists because she has lacks a sustain ability, like how the rest of the sustain-less champions are (,,.