Though it's worth noting that there are plenty of things that weren't original to D&D in the first place. For example, the distintive looks of the owlbear and l

Though it's worth noting that there are plenty of things that weren't original to D&D in the first place. For example, the distintive looks of the owlbear and landshark were actually directly based off dime store plastic toys imported from Asia, and various names like "prismatic spray" and "githyanki" actually come from preexisting fantasy novels.