New places. Tag needed to find new places in the castle to try and make slightly warmer. Even if his magic had always been rather weak, even when he performed it well, it wouldn't hurt for the castle to slightly warm up. That is, hoping most students were putting this charm to use now that they had it in their grasp.

Ah, there. The blonde came about to a place he felt heat was needed. The suits of armour. He could even try getting a few of them covered rather than just one.

He stood somewhere around the center suit of armour and practice his wand movement in one long swish, trying to cover a greater area than he had done before. After the short practice Tag said "Caelum Saepio" and swished his wand in one elongated infinity sign movement. A small fog floated through the air and around the suits of armour. There. That should do it for now.