英語版FF9日誌98 : On top of that,

 ダリで見かけた黒魔導士工場について、ガーネットがシドに報告しています。

 Dagger:

At the Village of Dali, we saw numerous black mages. They looked like golems, controlled by some powerful magic. On top of that, they were being created under Alexandria's supervision. I don't know how they're related to Vivi, but if Mother is planning to use them for war...

Regent Cid:

We won't let that happen. Even if she were to command an army of black mages, she won't make a move as long as we have our airship fleet. Don't worry <gwok-gwok>. Everything will be fine.

Dagger:

I'm so sorry, Uncle.

Regent Cid:

Now, now, come on. Don't be so formal. I'm helping you because I am your Uncle Cid, not because I am the regent of Lindblum.

Dagger:

Thank you so much.

On top of that, they were being created under Alexandria's supervision.

 on top of thatで「その上」という意味です。日本語と直訳過ぎてかえって覚えづらいです。