Sue can hurt ghosts

I dropped the staff and slapped my bare hand on Sue's hide. Though the dinosaur looked like a living beast, that was only appearance. Her own flesh was made of the same ectoplasm that the specters were-I had just poured enough energy into it to make it seem more solid. She was of the same stuff as the specters-and that meant that she could hurt them.
The Tyrannosaur stirred and then snapped her jaws to one side, closing on a specter and tearing it into fading light and globs of goo. She heaved herself to her feet, eyes sweeping around the ground in front of her for the next specter. It lifted a bow and loosed a glowing green arrow that sank into the muscle of her neck, and she bellowed in pain, but the arrow was no more than a bee's sting. One clawed foot came up and down and destroyed a second specter. The others let out wails and shouts of fear and anger and spread out to attack Sue, while the dinosaur lashed her tail around and looked for the next victim.


Dead Beat, page 364