Oh, no need to apologize, please
That was simply meant for the people who do not read the readme's
Resource is usually anything that's found on the map - flags, single runes, some cash, things like this.
As far as the battlefield is concerned, the items on it are generated on battle start, as the arena that the battle takes place plays a big part. Those chests and the ones the dragon digs out have their own content based on the difficulty of the arena (on which island it is located) and the general drop rate... As such it is unpredictable.
All that I can confirm is this:
You can get artifacts only from pre-existing chests on the battlefield. Those have the following chances:
- Gold (76%)
- Random scroll (15%)
- Crystals (5%)
- 1 random rune (3%)
- 1 wanderers' scroll (1%)
- random item (1%) - level of the item is based on the difficulty of the battlefield
Chests dug up by the dragon give:
- Gold (72%)
- Random scroll (15%)
- Crystals (5%)
- 1 random rune (5%)
- 1 wanderers' scroll (3%)