Troop Offense with Hero During an Attack I
Hero
Levels in total: 10
Upgrading from 4 to 8
Upgrade cost level: 6 ×3.7
Gold: 86 765 000 000
Chaos Elements: 9 398 000 000
Level by level
5: 14 430 000 000 gold · 1 554 000 000 Chaos
6: 18 685 000 000 gold · 2 016 500 000 Chaos
7: 23 680 000 000 gold · 2 571 500 000 Chaos
8: 29 970 000 000 gold · 3 256 000 000 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.