I'm looking to run the Rise of Tiamat module.
In "Episode 4: Neronvain" from the chapter "Death to the Wyrmspeakers", it says that
the green dragon mask is at the Well of Dragons,
which makes sense. But when I look at Neronvain's stat block (p. 91),
it has parts of the green dragon mask's abilities (poison immunity and Draconic Majesty) but not the others (Water Breathing, blindsight, and Legendary Resistance).
I'm planning to use the "Captive Cultist" encounter (on p. 7) to
give the players a chance to acquire a second dragon mask if they manage to get the information out of her and get to Chuth's lair in time. If they do so, I would use the Green Dragon Mask in his stat block; if they take too long, then the Cult of the Dragon would already have it.
My problem is that I'm not sure if this is a good idea or not as it would give them a lot (for context, I am adding more homebrew parts to my run of it such as lore, items, extra missions, and events that take place, so this isn't the only one).
What are the pros and cons for both sides of this approach, from anyone that has run this encounter? Please support your answers with your own experiences.