This is honistly vary simple and its the only resion im doing the guide cuzz i feel u ither have half a brain and figure it out on ur own or well u know theres this.
Why am i being a condisending duchbag becose guides are for chumps its not a puzzle go explore ull be fine.
but here "havea biscut" as vagita says.
*Tosses dog biscut at u*

1. Ull need to master alteration get all its perks.
2.Ull need to travel to the atronatch stone and activate it.
3(optional). U can have chrysmere dlc and well there u have it. ull Absorb 90% of all magic based Damage and convert it into magicka. This includes hazerds too like firepits etc.

Also dont ♥♥♥♥ on the fact u gota pay for the chyrsmere and say oh but its a pay to win sh sh sh u here that thats silence. Its the sound of pice. it has the same enchantment it did in morrowend if it was pay to win stendar's hammer would not require level 255player to weild it effectively at minimum.