Troop Defense with Hero During Defense I
Hero
Levels in total: 10
Upgrading from 2 to 8
Upgrade cost level: 1 ×1
Gold: 28 300 000 000
Chaos Elements: 3 060 000 000
Level by level
3: 1 950 000 000 gold · 210 000 000 Chaos
4: 2 900 000 000 gold · 310 000 000 Chaos
5: 3 900 000 000 gold · 420 000 000 Chaos
6: 5 050 000 000 gold · 545 000 000 Chaos
7: 6 400 000 000 gold · 695 000 000 Chaos
8: 8 100 000 000 gold · 880 000 000 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
1% · 3.5% · 3.75% · 5% · 6% · 7.25% · 9% · 11% · 13% · 15.5%
Total at max: 75%
Data: Viking Charts by Stars Night.