[MegaBlues]

So, +8 Def or Res for four turns, for twenty FP, is gross and no one would ever use it.

Shields already do the job of the Aegis skills much better, as Guard is always available without Momentum usage, and doesn't cost FP to use. Shields also grant some form of elemental resistance, usually.

The cost of these skills need to be decreased, or the duration needs to be increased, or the effects made more powerful.

Or regular Shields made worse.