Hero's Influence During Attack on Enemy Troop Health
Hero
Levels in total: 5
Upgrading from 3 to 4
Upgrade cost level: 2 ×1.7
Gold: 25 500 000 000
Chaos Elements: 2 720 000 000
Level by level
4: 25 500 000 000 gold · 2 720 000 000 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
0.25% · 0.5% · 1% · 1.25% · 2%
Total at max: 5%
Data: Viking Charts by Stars Night.