Tarsilno is an Altmer member of the Psijic Order, a monastic group of mages that monitor unusual phenomena throughout the world. He has been reluctantly convinced to use his magical skills to supervise the Thalmor's Blackreach project, but his personal dislike of their views and his order's apolitical nature have created tension between him and the Thalmor soldiers under his command. He is a supporting ally during the Blackreach section of the story.

Voice should be educated with a British accent, similar to other Altmer, though somewhat warmer and friendlier. Tone is thoughtful and professorial. Speech should be clearly pronounced.