Originally Posted by
The Glyphstone
Maybe the Draught makes you not 'count' as a Heterodyne anymore? The 50 families have their 'no resurrections' rule, the Heterodynes could have a similar rule exclusive to their family - turning yourself into a monster of some kind removes you from the line of succession. Keeps a limit on how crazy the self experimentation gets, and would be a rule the Castle would gleefully help enforce from its obsession with heirs. Gotta stay capable of breeding the next generation of Heterodynes.
That said, I don't think Oggie is a secret Heterodyne either.