Yeah, I thought of this when reading the thread title too.
You should probably pick something other than lasher as the name.
Seems interesting enough as a class in general, but there's just... no foundation for it in Warcraft.
I mean... other than the one scene of Garrosh using a chain to fight, has there ever been any person in warcraft who's specialty is a whip/rope/chain? Besides Harrison Jones, of course. It'd just be rather odd to see a large number of brand new shadow and arcane using whip wielders appear out of nowhere with an elite mastery of this weapon that's never even been seen before.