Lvl 1 Invoker - Meh, he's just farming



Lvl 5 Invoker - Gotta be careful to not get solo killed by him



Lvl 15 Invoker - Watch your ass. He's ready for some combos and shit.



Lvl 25 Invoker - MASS BKBS OR GET REKT BY A REFRESHER COMBO



After lvl 5, he starts to be fearsome at laning stage and after lvl 15, he becomes a real threat. Lvl 25? Unstopabble unless 5 manning him