Dragon breath's damage is based on the dragon's maximum hit points, not its current hit points.¹⁾

It is absolutely critical to note the rule in the Dragon monster entry which states that the DM must dice a 50-50 chance to see if a dragon will breathe.

A dragon can breath on approach when flying, and then use either its claws OR bite (but not both claws and bite).²⁾ In this case, no 50-50 chance is diced – the dragon can do both!

Spell selection is random unless the dragon has Genius or higher intelligence, at which point the DM can select spells.³⁾

A character who was eaten by a dragon has a percentage chance to be raiseable based on the creature's size, the dragon's age, and the time since being eaten.^Ex

There is an X-in-10 chance for the character to be unraiseable due to digestion, where X is the number of days that passed following the character's consumption before the character was “rescued”.⁴⁾ If the character has been digested, they are not raiseable, and their body is gone. If the character has not been digested, refer to the following table:

A character is more likely to be raiseable if the character is smaller and/or eaten by a larger dragon since less chewing is required.

Characters who are not digested but also not raiseable due to chewing can still be raised as long as regeneration is cast first.