Tremily is the combination of Emily+Trellis. There are little hints in the book, like the moment Trellis gets out of jail in The Last Council, he asks, “Where is Emily?!” Trellis was also curled up in a ball when they were arriving at Cielis with messy hair and everything. He must have cried himself to sleep because Emily wasn’t there! Also, When Trellis said, “I have to go back and help my people.” Then, Emily said, “What makes you not my people which is proof she wanted Trellis to stay.