Okay so I made the Altmer conjurer and at only Lv9 and he is WAY more powerful than anything I've had before. It's insanely awesome and epic!
Race; Altmer
Stone; Ritual (or just stoned heh

)
Base Overview; Relies exclusively on conjuration to summon both weapons and allies from Oblivion.
Skills; Every perk into conjuring, here http://skyrimcalculator.com/#86534
Attributes; 70% magicka, 30% health
Attire; Apprentice robes, apprentice hood, boots and gloves and a ring that increases my health by 20 as well as the Gauldur Amulet (very, VERY useful)
Personality; Typical arrogant Altmer, views most other races as childish and stupid (after all, who can amass true wisdom in a mere few decades???), hates Dunmer with all his heart and soul.
Back-story; Altmer mage who decided to further study conjuration in Skyrim. Nasty little mix-up near the border though.
Play-style/Morals; He is above any laws, save those set by the Dominion. Doesn't break them just for the heck of it though and will NEVER, EVER lower himself to theft or other petty crimes.
Tips; This is a very fun character for those who (like me) are lazy and prefer to watch others put on an excellent show but those who prefer to be in the thick of things may find it boring. I personally invested all perks into conjuration, and will later move on to one-handed. I normally summon a frost or flame atronach and then a blade and occasionally I help my servants in the fight. If your looking to play this character, then make sure you have a lot of magicka, and stay out of harm's way as you are not wearing armor. If preferred then one can study alteration to make up for this. I also have the awesome power of the Ritual Stone which can turn the tide of any battle by raising all nearby dead and putting them under your command, I don't really use necromancy other than that though. Some players will also choose to become vampires and this can help but I left it out, so far.
Again, I would like to say that this is possibly the strongest build in the game and if you know how to use it (a little Real-Time-Startegy experience can help), then you will wield awesome power. I recommend it to any pure-mage or just a warrior who wants some allies who aren't totally incapable of anything and go away after the battle (thank goodness!).