Now i never used all my perks and still have a dozen or so saved up and i'm level 67. I always play as a destruction type Wizard so i started off by bringing Destruction to 100 and using perks on everything in there except the intense flames, deep freeze and disintegrate. Then i got Enchanting to 100 and used perks on EVERYTHING in there. Next i then got my Smithing to 90 and used enough perks to get Daedic armor and then made a Armor and Helmet, improved them legendary, and enchanted the Armor with Destruction spells cost 25% less + Destruction spells cost 15% less w/ magicka regenerates 10% faster, the Helmet with Destruction spells cost 25% less and increase magicka by 62 points. Then i enchanted a necklace and ring with the same thing the Helmet has ie Destruction spells cost 25% less and increase magicka by 62 points. Now when i goto cast a destruction spell is doesn't show my magicka bar so i'm able to cast infinite without using any mana and then i pair it with slow time and i'm now a God of Skyrim just like i have been in all the previous Elder Scrolls!!!