The girl under the Truth Spell is pale and distracted. Counting in her head to twenty. 

The room is full of magic auras, of every school, not just spells in effect now but also spells that were in effect before, hanging in the air like magic dust, gradually unravelling. There's some divinations, some illusions, some conjurations, some transmutations, some abjurations. Some of them visibly stronger spells than others.

There is one enchantment on the girl. Its pattern is recognizable; it's the one he cast.

"Everything I've said so far was the truth," she says shakily when she has counted to twenty. 

The girl under the Truth Spell is pale and distracted. Counting in her head to twenty. 

Greater Detect Magic translates the vague sense of magic one can get from concentrating on trying to feel it into something visual. It's stunning. Humans are wildly better at interpreting information in this format. The room appears to be draped in glittering spiderwebs with half-familiar structures. Some of the spiderwebs are lively, tangible, looking almost strong enough to hold someone; some of them are made of dust, gradually drifting away but still retaining its rough structure. Some of them glow much brighter than others. The area at the door is glowing a lot. 

There is one enchantment on the girl. Its pattern is recognizable; it's the one he cast.

"Everything I've said so far was the truth," she says shakily when she has counted to twenty.