Thanks for the tip. Thats in the resto tree right?
Yep, and you need Resto 70 to get it. The only way to do that early in the game is to power level it. I don't usually powerlevel, but I did for my necrovamp and ended up level 20 with no offensive,crafting or defensive skills (other than wards), but it was fun facing challenging opponents and as I leveled other skills naturally through roleplay, he slowly grew very powerful. It was a nice progression, since your typical character starts out pretty tough. Once I got resto to 70, I roleplayed him from there on out.
Starting out weak was a nice change of pace. If you want to power level resto, get the atronach stone and stand in the wind at high hrothgar and cast fast healing over and over for about half anhour. The atronach stone will make sure you never run out of magicka while you are leveling. Once you get to 70, you can switch to whatever stone you want, although I stuck with atronach.
Also, after you become a necrovamp, the 25% boost will apply to your stone, but you have reactivate the stone to take effect. So I got 62.5% spell absobtion and plus 62 points of magicka from the atronach stone now. Perfect for a necrovamp mage.