Spell Critical
Potion
Grants Major Prophecy which gives you 2629 Spell Critical Rating for 36.6 seconds. (45 second cooldown)
Values at CP150. Durations are base, before the Medicinal Use passive extends them by up to 30%.
Brews into
Essence of Spell Critical
Reagents
Any two of these carry the effect, which is what makes it land.
Crimson Nirnroot, Lady's Smock, Namira's Rot, Water Hyacinth
Grants
Spell Critical applies this effect, tracked by name in a combat log.
Spell Critical is a critical chance source. Add it to the rest of your build, at roughly 219 critical rating per 1%, in the ESO Crit Chance Calculator.