@Lionheart: Alright, thinking it over, I think I'ma go with Art's ideas of stat changes, HOWEVER, I will say that his endurance be reduced to C due to the fact that he has Battle Continuation of A Rank, which is a mighty powerful skill despite what his Endurance may be. Saber is a Defender, from what I see, and by the looks of his shield, it serves more as a Bounded Field type Noble Phantasm in that it serves as a Conceptual weapon when not in use, but once activated, like you said, he can claim domain over an area and "protect" it as long as it is a structure capable of being protected.

So... I think with:

Str: B
End: C
Agility: C
Mana: C 
Luck: D

You'd be fine, I believe. Though what Art mentioned above did catch my interest, and I would perhaps read a few things that he may have mentioned if you'd want.