Now it was time to try those optional spells, which looked way harder, but Theo just needed to try. He'd heard of them all, and had cast Tergeo maybe once, but never the others. What did the other ones even have to do with cleaning? Impervius was something to do with water. Repelling it, or something along those lines. Theo couldn't exactly see water dripping from the ceilings, so how would he possibly use it?

Eh.. he would think of something.

Im-per-vius.

It was an easy incantation, thankfully, but he had no idea what the wand movement was, so he decided to just wing it and point. "Impervius!" Nothing happened... or did it? Theo bent down and examined his desk, and figured that the only way to find out, would be to spill water over it. "Aguamenti!" He cast his signature spell, allowing a little dribble to plop onto the desk.

And it dribbled everywhere, so the spell obviously didn't work.

No biggie, he tried again... and again... until it was his fourth time trying. "Impervius!" He lowered his wand, examined like he had done before, and then, "Aguamenti!" The water bounced straight off the table! Theo's eyes were wide with shock. Did he just teach himself a spell? Woah.... he looked around at the professor and BEAMED. Did this mean he got a gold star? Professor Bellaire always gave him gold stars.