And third idea - Upgrade whole "dragon thing":
For me its not mere skill, its more like an story element. Bring us more dragon lore. For example: create some location (mountains, underground tunnels) habitated with big but intelligent monsters (legendary giants, wyverns, behemoths). You will need to talk to them to solve a quest or to find a way through this dangerous location. But - they will not speak to human. You will have to use dragon form to get there and solve the quest. Also as dragon you have much more respect - there may live creatures that could serve you if you frighten them or kill their leader (they will serve only dragon, not puny human). These servants could be hired if you conquer some type of "dragon tower" (dragon fortress in a big cave) and make it your home.
Example of a quest - Myth of Mother Beast
Imagine there is small mountain/underground realm of giants. No road to get there for a human. Monsters live mostly secluded from other world. There are few tribes - tribe of cyclops, fire giants and wyverns. Each has some leader/king and adore few deities. But all tribes share one ancient myth - it serves as basic concept of their promitive religion. Myth about Mother Beast. They believe that their mountain world were created by one deity - they call it Mother Beast. But this deity was trapped by its own greedy son in an underground city made of gold. They believe that Mother Beast is sleeping for an ages in some formidable trap builded in a city. All tribes are searching for it, but never found it. There is a prophecy that one messiah will find this city, release Mother Beast and get huge power from that beast deity.
This myth is a part of their social hierarchy. King of each tribe fight for a throne in a series of challenges. They believe that the victor is not only their king, but also that messiah and will lead tribe to power. But when you - as a dragon - unexpectedly come to this world they will soon start to realise that a dragon, king of all beasts, may be the right messiah. And each tribe will try to persuade you to help them. Of course actual kings may hate you because you are threat to their rule. But some of their believers may think otherwise. So this is interesting battleground for some elaborate plot - searching for a Mother Beast. Player will choose the tribe he will help/cheat, but has to be careful about actual kings - some may attack without hesitation (and loose), smarter kings may try to use player as their puppet and then betray him. You will have to be smart (and strong) - even in dragon form you are not strong enough to kill whole tribe of giants. And one more solution - the player could decide to cheat all tribes and get reward only for himself - fantasy parallel to Clint Eastwood's gunfighter in Dolar trilogy.
And another piece of the story. Recently this realm of giants is invaded by some unknown race of monsters (umber hulks?). They are strong and plentiful and all tribes are their enemies. It seems that these umber hulks are also searching for Mother Beast. So you will have to be smart to defeat all obstacles and ultimately - meet the mythical Mother Beast. Or is it only a legend and is there some unexpected surprise waiting in that legendary city of gold? I believe it could be very captivating quest if done properly.
IMHO Dragon form is great feature. Dont add more fantasy races and other generic stuff - there are plenty of RPGs that do this. Concentrate on player's dragon and dragon lore/story - this could be "flag ship" of Divinity series in the future.
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Note for readers: please DONT post here all your ideas. Its meant only for bigger ideas about game system, quests etc. No chat about loot, respawn, better animations and similar stuff.
