Troop Defense with Hero During an Attack I
Hero
Levels in total: 10
Upgrading from 3 to 4
Upgrade cost level: 7 ×4
Gold: 11 600 000 000
Chaos Elements: 1 240 000 000
Level by level
4: 11 600 000 000 gold · 1 240 000 000 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% · 5.5% · 6.5% · 8% · 10% · 12.5% · 15% · 18% · 22% · 25.5%
Total at max: 125%
Data: Viking Charts by Stars Night.