[A second, huh... well, between awkwardly shuffling on his feet or trying his damnedest to hit up Saber without blatantly hitting on her, Gilgamesh goes for the latter option. May as well attempt to sharpen those conversational skills while he can. Maybe someday he'll level up to tenuous toleration.]

When you become a Knight, [because that's all but a given at this point] you will be able to read waves of mana for yourself, and manipulate them as you see fit. You'll be the strongest among us by far, as well, able to cut down hordes enemies in a single swing.

[There! Friendly, helpful, and informative. And more than a little complimentary, too. He can totally do this make nice thing.]

Although I cannot imagine you'll regain anything like Excalibur, which is unfortunate. Perhaps you might devise a new Noble Phantasm for yourself?

[Saber's Noble Phantasm...! Oh, he's getting excited just thinking about it.]