Hello,
Just investigating this one and wanted to clarify, Dungeon rewards will increase for battles not started after you have descended. You do not have to wait till daily reset.
As for the rewards, they are as follows from the updated patch notes
Mini Bosses will get:
- +1 Shard every Level
- +1 Jewel every 4 Levels
- +1 Diamond every 20 Levels
While the Mega-Boss will get:
- +2 Shards every Level
- +1 Jewel every 2 Levels
- +1 Diamond every 10 Levels