I play with a FS eir without moonpieces, and I can pretty much do damage with her.
I suggest this hybrid build:
LoP removes curses (except the reverse-direction curse). Also, unlike Antidote, you can dash out of it, so it's also used as a cancel (e.g. for Sunlight).
Max LE (1kHP addition) is good, but considering that no one can cancel that skill is annoying -- especially for knights (who mostly have level 3 Mdef). Level 1 LE is just for fake ressing purposes.
Light Shield (and a lot of people have seen me advocate this skill), is a good skill to have. You can put it at level 2 for 6secs of invincibility, but I just like it at max for 10secs.
Oh, and Holy shout is a one-point-wonder.
Holy Spirit is a mob controller, and for stage it is never
for damage so one point to it is perfectly fine.