As if on cue, Caster took form next to Fio, bowing towards her before turning to the sigil she had been examining just moments earlier. True, he didn't have to transition out of his spirit form as he did, but retaining a physical form helped him process his thoughts better. Subconsciously fanning himself, Caster looked at the circle from multiple angles before sighing and shaking his head.

"I have a vague idea of what the circle is used for- a bounded field, clearly- but without any further circles to compare it to, I cannot ascertain its strength or region of origin. I would, however, recommend we not tamper with it; it's very likely that the creator of such a thing had the insight to set up traps, and we might be in trouble if any of those go off." he stated simply before glancing at the books Fio had in hand.

"On that note, though, I would also like to prepare our own base of operations; should we continue without a suitable location for defense and recovery, this war becomes infinitely more difficult."