Wunshi's Focusing (Shaman/68)
1: Increase Max Hitpoints by 680
2: Increase HP when cast by 680
4: Increase STR by 85
5: Increase DEX by 85
6: Stacking: Overwrite existing spell if slot 1 is effect 'STR' and < 85
7: Stacking: Overwrite existing spell if slot 1 is effect 'DEX' and < 85
8: Stacking: Block new spell if slot 1 is effect 'STR' and < 1085
9: Stacking: Block new spell if slot 1 is effect 'DEX' and < 1085
10: Increase Str Cap by 85
11: Increase Dex Cap by 85
And the Stamina version: "Spirit of Fortitude" at the same level
1: Increase STA by 75
12: Increase Sta Cap by 40
After that, there is Dire Focusing (Shaman/73)
1: Increase Max Hitpoints by 816/850/884
2: Increase HP when cast by 816/850/884
4: Increase STR by 91/93/95
5: Increase DEX by 91/93/95
6: Stacking: Overwrite existing spell if slot 1 is effect 'STR' and < 91/93/95
7: Stacking: Overwrite existing spell if slot 1 is effect 'DEX' and < 91/93/95
8: Stacking: Block new spell if slot 1 is effect 'STR' and < 1091/1093/1095
9: Stacking: Block new spell if slot 1 is effect 'DEX' and < 1091/1093/1095
10: Increase Str Cap by 91/93/95
11: Increase Dex Cap by 91/93/95
(The difference in numbers being for various ranks of the spells).
And the stamina version, Talisman of Persistence, at level 71
1: Increase STA by 83/86/90
2: Increase Endurance Pool by 480/500/520
12: Increase Sta Cap by 50
(Again, separated for ranks of the spell).
I believe Agility is the only melee stat that doesn't have a spell similar to Wunshi/Fortitude. But, in the end, if your stats cap out at 415 with aas, being level 75, you can have a grand total of 510 str/dex, 465 stamina.