Shocking Grasp now shuts down Opportunity Attacks rather than all Reactions. Shutting down all Reactions is too powerful for a cantrip. This cantrip has always been meant to provide a partial Disengage, which it still does in this version. Like other Lightning spells, the spell also no longer makes distinctions about whether the target is wearing metal. (this is the new option, and only option. Just Shocking Grasp, no old version).
— Changes due to 5.5
I really do try to make most of this original, but since Forgotten Realms is an integral part of the world I can't help if anything is used without formal permission, but is still "fair use" as I am just using this for my private games.