Last time I asked him when dragon tombs will happen, he told me 3 months later than before I had asked >.<
How it works, Minibosses can spawn anywere in the wastelands, In chunks that have been loaded by the player if there are less chunks loaded, More likely chance of a miniboss spawning near you!
If I remember correctly, Enraged and Miniboss spawns are set so they randomly spawn anywhere where a normal mob would spawn (within a certain distance of the player). If the chunks not loaded, no mobs simply spawn there. So really less players = more bosses.
That would actually be a good idea, 100x100 or so plots in the wastelands you can tp to for resources, it would be pretty awesome, and it would go to the height limit and bedrock limit, that would be pretty awesome, you should add that guys!
That would be very abused and the plots, correct me if I am wrong, are 60x60, you are not able to teleport to it, and you need a dragon egg, and this is the wrong thread