From what I know of Yorick's new lore, it is implied that Yorick uses the power of the Black Mist to combat them. The actual "evil" force that cursed his homeland. He uses "fire" to combat "fire". This is very akin to what Kassadin does; using the powers of Void to combat the actual Voidborns and Void allies that want to destroy Runeterra.
I am right or wrong?
Well with that logic then 
is basically 
as well.
From what I know of Yorick's new lore, it is implied that Yorick uses the power of the Black Mist to combat them. The actual "evil" force that cursed his homeland. He uses "fire" to combat "fire". This is very akin to what Kassadin does; using the powers of Void to combat the actual Voidborns and Void allies that want to destroy Runeterra.
I am right or wrong?
kinda, except yorick is counter intuitive. by the looks of it he kills people and enslaves their soul just like thresh does, except he uses those souls for his own personal vendetta. the problem is we dont know how powerful the ruined kings control over the mist is, so yorick might THINK he is making his own personal army more powerful when infact all the souls he collects is under the control of the ruined king, including him.
its a possibility anyway.
also, im pretty sure no one aside from maybe hecarim actually likes or cares for the ruined king. thresh has his own agenda and everyone else seems to really dislike the guy in general.
