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I like the idea and the domain generally looks good to me. A few thoughts:
Being able to dominate a fiend at 5th seems to strong to me, I would suggest maybe charm instead.
Demonic isn’t a language. I would make it Abyssal and Infernal.
The domain spells at 17th seem really strong and, frankly...
I Think that remains to be seen. The silver dragon image in the new PHB looks pretty much like the 3e+ design. And really the new red dragon is pretty similar to the 3e+ design too. Differences could be simply artistic style.
So I wouldn’t call those big refreshes. Now, those two are also the...
I would rather have more Grayhawk as a template how to build a world and a magic Academy. That is absolutely useless to me. If we’re talking about just what we want.
Just wanted to clarify, if giants are the same density as humans they would be between 4-6 tons (using the square cube law) not 100 tons. Not that it makes a real difference in your example