This is for main support Rei.
NOTE: This is a loadout for a new champion. Her optimal loadout isn't solved yet. If I post newer Rei loadouts in the future, consider those instead.
The 3rd slot, I'm not sure about. Will test Enveloping Magic vs. Aico Forces and other options.
Deft Magics is strong for the other talents, but it does less with Focus since you can only swap Spirit Link targets every 1 second instead of every 6 seconds.