The mare gets an idea. The spell “SUN”, “POWER”, “OBJECT” made that bullet glow and provided light. Perhaps if she turned the “SUN” to “MOON” to make an object less visible, or maybe even completely disappear!
She just needs to choose something to try and enchant, and whether or not she should try any “BIG” runes on it. She remembers the books says experimenting with runes is a really bad idea, but Mulberry is a bit out of options.