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...and they get one shot. Seriously, though, I find Veigar to be one such hero that, in the hands of a good player, is not to be trifled with. You might look at him and think to yourself, "Oh look a Veigar, this should be an easy kill." for he is notoriously squishy. But the build I am offering here is one that will make you think "RUN!" Veigar is weak early game but can be an absolute destroyer of worlds late game, especially in the midst of team fights where Dark Matter and Event Horizon reign supreme!
Equilibrium (Passive):Veigar's mana regen is increased by 0.5% for each 1% of mana missing.
Basically, the more mana you are missing, the more mana regen you have. This ability is good since Veigar is using his abilities constantly to get his AP (ability power) up.
Baleful Stike (Active):Unleashes dark energy at target enemy dealing 80 / 125 / 170 / 215 / 260 (+60% of ability power) magic damage. If the target is killed, Veigar gains 1 ability power.
(Passive):Veigar gains 1 / 2 / 3 / 4 / 5 ability power when he kills a champion from any source of damage.
This is what builds Veigar into such a terrifying endgame force. You are to get this ability first NO MATTER WHAT, then max it first. It is a built-in permanent Mejai's Soulstealer (over exaggeration obviously). These are permanent AP gains too, so dying won't affect them at all (though you do want to avoid dying).
As soon as you get this ability, use to last hit creeps every time it is up to get as effective as a farm going as possible.
Dark Matter (Active):After 1.2 seconds, dark matter falls from the sky to the target location, dealing 120 / 170 / 220 / 270 / 320 (+100% of ability power) magic damage.
This is one of the abilities that hits like a truck. It gets 100% damage bonuses from AP, so if you have 800 AP, this thing does 800 extra damage. It can be hard to hit people, though, for it is a delayed spell. Try not to harass so much with this early game. Save mana for AP farming. In fights when your intent is to kill, it is best to start with your stun and then drop this on their head.(I get 2 ranks in the stun before maxing baleful strike because the stun time on the first rank is usually too close to dark matter's delay)
Event Horizon (Active):Veigar twists the edges of space around the target location for 3 seconds, stunning enemies who pass through the perimeter for 1.5 / 1.75 / 2 / 2.25 / 2.5 seconds.
Without a doubt, this is THE BEST stun in the game, simply because of the positioning you can do with it. If you want, you can spawn it right on top of enemies for instant ranged stuns. It's also part of what makes Veigar so threatening even without the AP. Open with this followed by Dark Matter, Baleful Strike, and Primordial Blast, and you can potentially three shot champions in certain situations late game.
Primordial Blast (Active):Blasts an enemy champion, dealing 250 / 375 / 500 (+100% of ability power) plus his target's AP in magic damage.
Basically, it makes Veigar the bane of all AP champions. End of story. Also the 100% AP boost is equally terrifying. At 800 AP, firing at an enemy champ with 800 AP, you have the potential to do 2100 damage (before magic resistance of course) Don't worry though, it still does enough damage to make AD (attack damage) stackers run in fear as well.
Ignite-Why? It's a great spell for DPS to get kills. It's a DoT that can make or break those 2 soul stacks from Mejai's.
Flash-Why? Positioning and escaping. I find ghost to be very easily countered and not very useful on Veigar. I don't advise against it on Veigar, it's just a matter of personal preference.
Teleport-I didn't mention this, for this is rather situational. This is GREAT if you mid with Veigar for the purpose of ganking and building up stacks. You can also use it regularly, your choice.
Just, for the love of reason, don't get Clarity, Heal, or Revive. DON'T. Clarity may seem helpful, but Veigar gets enough mana regen as is.
Now the gear is straightforward, although there are some variations in gear that can come about depending on how the laning phase pans out.
Mejai's Soulstealer-This does not necessarily need to be your first buy, nor does it need to be required. I put this in because we are going for the most damage possible, and Mejai's helps us reach that goal. Notes: if you are doing badly this game, avoid Soulstealer. If you generally do badly with this champion, avoid Soulstealer. Get it only if you haven't died yet and you have gotten either an assist or a kill.
Rylai's Crystal Scepter-You have a stun already, so this isn't truly needed, however if you feel like you must get more survivability, get this.
Deathfire Grasp-Caster's don't get a Bloodrazor...but this is a nice alternative. Plus the mana regen is good for Veigar.
Since you're stacking AP, enemy Veigars must be either avoided or eliminated immediately to ensure your safety.
Magic Resist stackers gimp Veigar's DPS, so save those guys for last. Go for the ultra squishy carries first.
This build for Veigar can potentially make him a glass cannon, so it is imperative that you STAY MAX DISTANCE IN TEAM FIGHTS (caps makes me serious :P).
Just one note actually. Veigar can be extremely powerful, but he doesn't just become that pintsized, demonic endgame without work. That would be OP. Veigar requires a fair amount of farming with Baleful strike so he can build up AP. So if you're confident, take mid for you will get a better farm there, but only if you think you can handle the enemy mid. If not, lane with someone you should be able to keep enemies at bay while you farm.
I hope you enjoy striking fear into the hearts of all your enemies with this guide. Have fun, and make them cry. :D