Defense only to protect Foci

[Lord Liaden]

5E p. 189 mentions how Breakable Foci can have exotic Defenses such as Power Def. or Lack of Weakness bought specifically to protect them from such attacks for a -2 Limitation. Is that -2 Lim cumulative with any Focus Limitation, or only -2 whatever type of Focus the Defense is bought for? Also, could you apply the same Limitation to more standard Defenses only to protect a Focus, such as Armor or Force Field?

[Steve Long]

It’s cumulative with the Focus Limitation (after all, the character loses it if he loses his Focus, and then someone else gets the benefit of it), and you could apply it to any sort of Defense Power you wanted (and the GM was willing to allow).