Mulberry asks if he thinks she can use it to cast rune spells.
Antoine pauses for a second, giving the mare a pursed lips glare, and then says carefully, “…Yes, probably. That seems to be the function of the thing after all. But I would not take these rune spells lightly. If you don’t know what exactly a spell will do you shouldn’t cast it.”
Mulberry then asks about Birdsong College, and what’s in it.
Antoine pauses one more time, and then sighs and says, “Well below the college is a secret chamber. The path to it is located in through the meeting hall of the college. To activate it you need to pull a switch located in the chandelier of the office behind the meeting hall. Down there you’ll find…”
He stops here to think again, and then says, “Best I not tell you too much about the creature you’ll find there. Go in, destroy the runes in the chamber, and get out.”