Trell was the commanding officier during the Battle for Deltora. He led the Shadow Army into battle and worked closely with Sheela. He was shocked when he saw Greers falling to their deaths and could not believe what he was seeing.
After Sheela had seen the downfall of her Greers, she realised she was no longer needed and prepared to gallop away. Trell asked her what she was doing and ordered her to remain. When Sheela further angered Trell by mocking him, Trell stabbed her, piercing her heart.