Idea For The New Shield Bash Rune
Change it to where it also works when shielding an ally, but the ally gets the buff and not you. Of course, it would have a weaker effect when used on an ally.
Enchanters are in a pretty weak spot, and due them requiring so much balancing, it's rare, if ever, they get any attention until it's far to late and the whole community hates them. Resolve could be a great secondary for Enchanters, mostly due to it having Revitalize, which grants a bonus to shield and healing power, however, that's the only rune in Resolve that's actually a good choice for Enchanters, aside from a few unique cases such as Rakan and Taric. By adding this small effect, it would open up a whole new pathway for Enchanters, and be a nice, small buff for them after Riot went overboard in patch 8.12 and nerfed Enchanters, and all their items.
The issue with the more traditional Enchanters, such as Janna and Soraka, at least in my opinion, is that I already feel forced to take Sorcery as my primary because of Summon Aery, with Inspiration being a must have because of all the cooldown reductions from Cosmic Insight. By letting Shield Bash effect shielded allies, it would let Reslove become a genuinely viable option for the more traditional supports, and open them up to more options, because right now, it just seems pretty limited.