Son of the Serpent
Pupil
There is a famous example of something other than a dragon doing this that could help you out. The fact black dragons are known for having a lean toward necromantic practices will help here. I dont know if it will work in your edition. If it doesnt just say naughty word the rules and go with it anyway if you like it.Hi! So I'm curious about making a specific dragon a recurring enemy, but I want her to grow stronger as the party does.
Of course, dragons do have several stages of life, but they grow slowly with age; the difference between a "young" dragon and "adult" dragon can be decades, and the difference between adult and ancient can be hundred of years.
So my question is... what can a dragon do if it decides to accelerate its own aging, in an effort to defeat troublesome adventurers?
The idea is that this young dragon failed to defeat the heroes within it's own lair, and although escaped, sees no other recourse but to "hit puberty quick!"
The dragon does have some humanoid assistance in local followers, including lizardfolk, ogres and bullywugs. What I want suggestions for are things like specific spells, rituals, items or patrons that the dragon would seek out to accelerate its aging.
If you can, point to a source in a D&D book where this has happened (I'm sure it has somewhere). But if you've got a great idea, I'd love to hear it!
EDIT: It's a black dragon, starting this as young.
Strahd (the vampire. Yes that very one) had a sister or a female cousin (i forgot which). She too was a vampire. Vampires like many undead passively grow more powerful with age. She didnt feel like waiting thousands of years and wanted a quick no effort boost. So she hatched a plan. Ghosts have an ability to age people. This is non harmful to vampires. Only helpful. She had a lover who was a ghost. For an entire night she tortured her lover and let him use his aging abikity on her over and over and over in blind vengeful rage. At the end of the night she had gone up several age categories and had the evolved undead template.
A black dragon is not undead however and grows larger as they age. So i recommend an adjustment.
Have him do the same thing with a ghost he gets his claws on. Have him be in his alternate humanoid form THE WHOLE TIME (with the classic 10 dragon species the alternate form is technically an alternate true form which is almost never touched on in the lore. The point is its not actually "false".) this is to avoid problems with rapid growth that we cant account for because we dont have examples.
Have a ring of sustenance to offset starvation that presumably would jave occurred if he went the long way if aging and didnt eat during those hundreds of years.
This should result in an ancient wyrm in short order.