the Jester
Legend
I like the ideas presented, but I think the implementation needs a little work..
For instance, the 4 auto-saves, well, that's quite a lot of work for the DM in my opinion, figuring out when best to use them - and it leads to this dynamic where the DM wants to know what spells he ought to save them for, so asks the players what they have prepared, and it becomes adversarial.
Or you have a good dm who plays the dragon based on what it knows.
God I hope we dispense with all of 4e's "Tell everyone everything!" conceit.
You could also let it have advantage on all saves, as magic resistance.
Uh... it does.
The legendary actions, again, seem like a lot of work for the DM, and they might be a bit skewed. Can each one only be used once each round? Otherwise the healing 20hp 4 times could drag the fight out forever.
Okay, I'm guessing a lot of folks are commenting without actually reading the stat block? It's clearly spelled out. You can't use the same legendary action consecutively.