Lichtkreis + Grail Sphere = Ultimate duo of asssaving.
I remember on my first SC run (on Hard), the penultimate battle, one of the hardest battles series wide, 25 minutes in...
I almost game over'd
Only Lichtkreis was able to save my Ass by reviving my dead Party and then Kevin giving guard.
Or another late game battle Kloe was the sole MVP by reviving my Party like 5 times in addition to dealing the most damage. She has the highest ATS, so she can dish out alot of magic damage