Editing Fate/Zero:Act 1 Part 5 (section)

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“Have you accurately memorized the incantations of summoning?”

Matō Zōken reminded Kariya again and again for safety’s sake. The latter nodded in the darkness.

Full of the foul odor of rot and dampness, a green darkness as that of the depth of the sea. This is the worm storage hidden deep beneath the ground of the Matō residence that stood on the hill of the small mountainous town.
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“That’s good. Only, midway through the incantation, add two more lines of incantations.”

“What do you mean?”

Zōken smiled ominously towards Kariya’s confused expression.

“Isn’t it obvious? Kariya, you should know that as a magus, your abilities are not just one or two notches below the other Masters. It will affect the basic abilities of the Servant. 

If that’s the case, it can only be amended through the Servant’s Class, and we must raise the parameter from the root up.”

Predetermining the Class of the Servant through the alteration of the summoning incantations.

Usually, the assignment of Servant Classes is inevitably decided by the summoned Heroic Spirit’s own attributes. However, there are exceptions; two Classes can be designated by the summoner beforehand.

One of them is Assassin. The Heroic Spirit that belongs to this Class can be assumed as a group of killers that inherited the name of Hassan I Sabah.

And the other class is for all Heroic Spirits and can be manifested as long as the summoner incorporates the required foreign ingredients. Therefore – 

“This time, give the summoned Servant the attribute of ‘Mad Enhancement’!”

Zōken declared loudly with an overjoyed face, as if welcoming the disastrous implications contained within it.
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“Kariya, as the Master of Berserker, fight for me with all that you’ve got.”