The third edition of "D&D" classifies dragon as a type of creature, simply defined as "a reptilelike creature, usually winged, with magical or unusual abilities". The dragon type is broken down into several classifications. True dragons are dragons which increase in power by age categories (wyrmling to great wyrm). Lesser dragons do not improve in age categories and may lack all of the abilities of true dragons. Examples of lesser dragons include dragon turtles and wyverns. Other creatures with the dragon type include drakes, felldrakes, elemental drakes, landwyrms, linnorms and wurms. (An unrelated creature called a dragonne is named for its coincidental resemblance to a brass dragon.)