Mia answered hastily, busy tracing different purple glyphs in the air. The reason her trap took so long was due to the nature of her target: a Shadow. Naturally intangible to any physical or magical offensive that didn't involve light, it was very difficult to restrict it. For this, she needed a series of coordinated spells by playing on the assets she had against a creature of this kind, including the Erebus' Elixir that nullified its intangibility. Even for a natural genius in assembling, merging, coordinating, and even creating restriction spells like Mia, it needed some time.