What Veigar needs
His reliability has dropped hard since his rework (I had about a 75% win rate with him before, it has dropped to about 60%).
This is because of his stun having a delay along with people finally building merc treads to counter it (after the damage has been done to his kit).
But the thing is I actually kind of like new Veigar. He just needs a little bit of improving in his ult range and making his stun not effected by tenacity if the counter play is not running into it like an idiot. Although now it has the added utility of stopping all dashes. That is right even LB jumps stop instantly when they ram their face into it.
Honestly, most people stun themselves because their reaction is to try and walk out when they are in the dead center of the box and if they walk into a wall as it forms it's their fault and they should be punished. The only way to get out from dead center, is very high MS or dashes/blinks. Veigar should get some kind of compensation for people who slam their face into the wall because they would rather eat the stun instead of damage when they already built merc treads so it basically guarantees a dodge. I feel like no tenacity CC reduction (or at least halved) would be the way to go to fix that.