Troop Offense with Hero During an Attack I
Hero
Levels in total: 10
Upgrading from 4 to 7
Upgrade cost level: 4 ×2.9
Gold: 44 515 000 000
Chaos Elements: 4 814 000 000
Level by level
5: 11 310 000 000 gold · 1 218 000 000 Chaos
6: 14 645 000 000 gold · 1 580 500 000 Chaos
7: 18 560 000 000 gold · 2 015 500 000 Chaos
The price depends on the order in which you study a branch: the first costs the base price, the seventh is four times as much.
Bonus by level
2% · 7% · 7.5% · 10% · 12% · 14.5% · 18% · 22% · 27% · 30%
Total at max: 150%
Data: Viking Charts by Stars Night.