I guess I'm saying using the episode as basis for the mechanics might be a little wonky as all the effects of the dragon breath only affected the mooks.
Might also want to think about adjusting adding some spells to players lists granting abilities to negate these effects.
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Yes, but that's because the mooks followed orders and didn't run away. All of the important characters:
1. Weren't in the path of the dragon fire on the first pass (because it was making a hole for the Dothraki to exploit)
2. Ran or were pushed out of the way of the dragon fire.
I'll also point out that dragons age much faster in GoT
RAW, an adult red dragon has a 60 foot one, and an ancient has a 90 foot cone. Compared to GoT (or Smaug), these seem to be much shorter ranges. I'm not a fan of the D&D shaped cone, either. I'd prefer it to be twice as long as wide, but RAW that 90 foot cone covers an area 90 feet wide.
So that's a 90 foot long wall of fire, and since I've always considered dragon fire similar to magical fire (although in AD&D it was equated to a
fireball spell which was stronger than magical fire), I'd have no problem with it igniting everything flammable in the area.
The rules generally state that clothing and equipment that is worn doesn't catch on fire. I've always found that absurd. The saving throw is enough to me, and then you have to deal with the flaming equipment and spend a round putting it out or doffing it. Again, I prefer fire to be something more than, "oh, that's only going to cause 2d6 damage, I can handle that."
In AD&D,
fireball melted soft metals like gold, silver, and copper (and was why Ernie Gygax invented
cone of cold because he wanted to get around the fact that they were melting their treasure). In fact, I'd have no problem with dragon fire being capable of imposing the effects of
heat metal for a round, or being immolated by fire in general having that affect as well.
The important thing about boosting the power of fire is that the players have to understand that fire is as dangerous in the game world as it is here. As long as they realize that it is much, much more deadly than the RAW, then they'll react accordingly.