Actually, the invoker's meteor is weak compared to that crazy magical ball shit. 1 spell ALL creeps die, guranteed.

Try Wex + Exort + Wex. Energy Ball - Insta-cast, 3 second activation, 250 mana cost, 400 AOE, Max damage of 800!!! 100 damage for every level of Wex. This is the ULTIMATE farming skill. I see this getting nerfed real fast because this will kill even mega creeps easily because you can cast it twice.

Even with BKB, I imagine it won't be so easy to kill the invoker because with 3 Wex, he's got Nightstalker speed. He won't be easy to chase without lots of stuns and slow. And with 3 Quas, his normal damage is really high for an INT hero.

Other notable skills is his 400 Mana Manaburn. You can cast this twice so you can burn 800 mana within a second. Ouch!

He also has this godly magic shield, which lowers magic damage by 80%. Twice as good as an Anti-Mage. I doubt a max level laguna blade will even do 100 damage through this.

Next is that disarm skill. 1200 range, duration of 8 seconds. Completely disables a hero's normal attack. If you're a melee hero and don't have a BKB, damn I'd feel sorry for you if you attempted to attack an Invoker one on one. If he can't kill you in 8 secs, he can always refresh the spell and cast it again! So 16 secs of just running, fun.

Another notable one is his Tornado. It maxes out at 2000!!!! range and 475 damage. It's like a Shockwave with 2000 range, although your Quas must be maxed for it to shoot this far. But wow, you can wipe out ALL the enemy creeps from like sniper distance.

Deafening blast is also not bad. 4.5sec silence plus around 600+ damage. This is like a super version of the Nightstalker's Void + Fear, except it doesn't slow. I can see this to be quite crippling vs. caster heroes in a 1 vs. 1 situation.

Portal is also one of his better skills. Deals decent damage and pulls the enemy towards you. It's like a meathook from hell which never misses. Luckily the range isn't very far. I believe it maxes out at only 600 range. To get a 'dismember' like effect, you can Disarm or Deafening Blast immediately after a portal.

Shroud of flames is pretty damn good as well. In recent patches, they nerfed Axe quite a bit. He has a 175 damage AOE counter attack with 15% chance and a max of once per 0.6 secs. Now.... shroud of flames is 80 damage frontal AOE counter attack with 100% chance and no limit... Partner with Axe and cast Shroud of Flames for nasty results. However, the damage only maxes out at level 15 minimum.

There are alot of other notable skills, but just too many to mention.