MaxHP + 1% and Res + 1 per 15 base STA of the user.
If the enchanted armor is grade D, additional MaxHP + 1% and Res + 1 per 15 base STA.
If the enchanted armor is grade C, additional MaxHP + 1% and additional Res + 1 per 15 base STA.
If the enchanted armor is grade B, additional MaxHP + 1% and additional Res + 1 per 15 base STA.
If the enchanted armor is grade A, additional MaxHP + 1% and additional Res + 2 per 15 base STA.