Not Updated For Current Season
this is my guid from veigar....
Passive: Equillibrium - Veigar's mana regen is increased by .75% by each 1% of mana missing.
A decent passive. Combined with a meki pendant, it should allow you to stay in your lane and farm for a long time.
Q: Baleful Strike - Active: Unleashes dark energy at target enemy dealing 80-260 (+0.6 per ability power) magic damage. If the target is killed, Veigar gains 1 ability power.
Passive: Veigar gains 1-5 ability power when he kills a champion from any source of damage.
This ability is the reason why veigar is the most common champion to see with > 600 AP. Last hit, last hit, and last hit some more! That is what you should be doing with Baleful all game. I don't care if you can kill the minion with an autoattack, the extra AP you get from this ability makes a huge difference. Play some practice games so you can get this skill down. It's very important.
One more quick note - If the enemy grabs a Banshee's Veil, this is the spell you use to pop it (before you stun).
W: Dark Matter - After 1.2 seconds, dark matter falls from the sky to the target location, dealing 120-320 (+1 per ability power) magic damage.
Veigar's main damaging ability with a 1:1 AP ratio. This ability has two major uses. You can, a) nuke the opposing team for terrible, terrible damage, or b) use it to farm minions (once it is maxed). Other uses for this ability include scaring away the enemy when they are chasing you, checking brush and neutral creeps, and scaring the enemy away from attacking your tower.
E: Event Horizon - Veigar twists the edges of space around the target location for 3 seconds, stunning enemies who pass through the perimeter for 1.5-2.5 seconds.
You are going to come to love this stun. It is an AOE stun that can turn the tide of teamfights. The enemy is stunned on the outer edge, so you want to try to land the edge right on their face. Again, this one will take some practice to land. Only repetition is going to help. The main use for this ability is to set up your combo (covered later). It can also be used to catch enemies for chasing, to stop enemies chasing you, and (my favorite) to stick those guys who try to towerdive you in their place for the kill.
R: Primordial Burst - Blasts an enemy champion, dealing 250-500 (+1 per ability power) plus his target's AP in magic damage.
Gotta love Veigar's ult. Once you ult a caster once, they will run all the way to their nexus every time they see you coming. 1:1 AP ratio + the opponents AP can add up to a whole lot of damage. Use it mainly on the enemy caster in your combo to instagib them. It can also be very useful against non-AP champions as well.
beginn of the game:
first do nice last hitting with ur Q spell to get more AP
and steck ur tear of the goddess up for more mana (archangels passiv : more mana more ap)
when u see that u have ap champions on ur line take the blue pott for ap and take first the shoes and archangels staff and than rod of ages or rylas
get kills for gold ! (ganks...)
and look for ap player of the other team when they have ap u make more dmg !!!
u are a maschine :P
Be carefull with veigar he have low health !
i took ghost because he is so slow and teleport that he come fast on the line for farming
with the mana reg runes u don t need a clerety u have a nice passiv reg and the runes are enough.
when the other team have high life champions take a deathfire grasp because of his passiv
when u see u are the focus of the other team and get very much dmg buy a zhonyas ring it will help u when they want 2 focus u, u go in zhonyas so they do the spells on other campions and u have a easy fight ;)
i hope it will help u a little bit and u like this guide try u play it and u like it ;)
when u have other questions ask pls ;)