It is my home. [ It's a simplified and mostly true answer, at least. ] I have obligations that I cannot abandon whenever I choose.

[ As much as traveling with the Nein may sound appealing on occasion. On the other hand, fighting dragons and some of the other things they've found themselves entangled in is decidedly less so. ]

Transportation, until Caleb learned the required spells. And as a liaison to the Bright Queen herself, when appropriate.