Most parasitic relationships are commensal, where the host is not significantly harmed or aided. Some are antagonistic, with the host harmed, and some are symbiotic, with the host and parasite both gaining value.
So, it stands that dragons must have parasites. And like dragons, they will be odd and perhaps unpredictable.
Dragon Louses |
For a dragon of any particular age range, there is a 5% chance that they have become exposed to parasites, either via another dragon, or through another vector. For our S&W dragons, this translates to a 5-40% chance that an individual dragon is parasitized (in reality, the chance of parasitism of an organism is greater, but dragons are magical, resistant beasties...).
Conversely, older specimens are less susceptible to side effects from parasites, and the likelihood of a parasite directly affecting an infected dragon will be 100%-(5% per age category); e.g. an ancient dragon will have a 100%-40% = 60% chance of a direct parasite effect. Effects will be determined by the table, below. Effects from the parasitic infection may be positive, negative, or (since this is S&W), odd...
Parasite Effect Table
Roll d8 & d4 - first is column, second is row
* - i.e. d6 to d8, reverse for decreased die
|
D8/D4
|
Effect
|
1
|
2
|
3
|
4
|
|
1-3
|
None
|
No
Effect
|
No
Effect
|
No
Effect
|
No
Effect
|
||
4-5
|
Positive
|
Increased
breath damage (increase die by one*)
|
One
additional attack/ round or increase damage by one die
|
Faster
movement (+5% per age category)
|
Additional
breath weapon use (+1/day)
|
||
6-7
|
Negative
|
Decreased
breath damage (decrease die by one)
|
One less attack/ round or decrease damage by
one die
|
Slowed
movement
(-5%
per age category)
|
Decreased
breath weapon use
(-1/day)
|
||
8
|
Odd
|
Breath
weapon of another dragon, random
|
Dormant eggs or cysts may be carried by a host creature, with a bite or consuming by a dragon required to hatch the organism.