[Bilden nedan, taget från FRwiki, är vad MM-bilderna en halvdragen ser ut.]
Sida 180 5.0 Monster Manual, Half-Dragon:
Senses. The half-dragon gains blindsight with a radius of 10 feet and darkvision with a radius of 60 feet.
Resistances. The half-dragon gains resistance to a type of damage based on its color. [table follows]
Languages. The half-dragon speaks Draconic, in addition to any other languages it knows.
New Action: Breath Weapon. The half-dragon has the breath weapon of its dragon half. The half-dragon's size determines how this action functions.
A creature might also transform into a half dragon as a result of a mad wizard's spell or a ritual bath in dragon's blood. In all cases, the result is a creature that combines the essence of a dragon with the form of it's original race. A typical half-dragon's life span is twice that of its nondraconic line, so that a half-dragon human might live more than a century and a half.
Ge dig form och utseende av en drake för det mesta och ger hime mer tid att leva och göra det till sin fulla återhämtning.
Så dunk honom i ett blodbad i draken och ha en drakonisk kult eller en grupp drakeyrkare eller något ritualiserar honom närmare sin sanna form.