Lyndwyrm

In the Squawk Role-Playing Game, Lyndwyrms are intelligent theropod dinosaurs with massive horns and shaggy manes. Lyndwyrm horns are inspired by the horns of Carnotaurus, but they are much longer and twisted like the horns of Triceratops.

(The lyndwyrm images above were modeled and rendered with Blender by my brother Ulrich.)

The feathery mane is inspired by the primitive plumage of real life dinosaurs such as Dilong paradoxus, which are thought to be close relatives of Tyrannosaurus rex. We don't know for sure whether the direct ancestors of T. rex had feathers. If some of them did, then it is likely that T. rex itself had some feathers.

More pictures and information about lyndwyrms...

Drome

In the Squawk Role-Playing Game, dromes are intelligent theropod dinosaurs. Several drome features suggest that they are primitive theropods like Eoraptor, Herrerasaurus, Coelophysis or Dilophosaurus, and not bird-like coelurosaurs like Tyrannosaurus, Velociraptor and modern birds:

Dromes have a narrow ribcage instead of a broad, bird-like bellows. This suggest an aerobic metabolism somewhere in-between a normal "reptilian" and avian system. They have skinny legs and relatively small hips instead of thickly muscled thighs. Dromes have four fingers on each hand, and they are covered in scales instead of feathers. (So far only ceolurosaurs have been discovered with feathers.)

More pictures and information about dromes...