Maxing a skill doubles its damage, and the cheap levels come first
All 848 hero skills whose main hit scales with ATK deal exactly double damage at level 11 compared with level 1. The cheap levels come first.
- Levels 2 to 5 are the bargain: +34% damage for 50,000 gold and 2 Legendary Codex on a Legendary.
- The last four levels add +44% but take 170,000 gold and 10 Legendary Codex.
- Spreading early levels across several main damage skills gets more from scarce Legendary Codex than pushing one skill to 11.
Costs for every rarity, with a calculator: Skill upgrade costs.
Every skill follows the same steps
Same for every hero, rarity and skill slot:
| Upgrade to level | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 |
|---|---|---|---|---|---|---|---|---|---|---|
| Damage added (of level 1) | +6% | +6% | +10% | +12% | +10% | +12% | +10% | +12% | +10% | +12% |
| Running total | 106% | 112% | 122% | 134% | 144% | 156% | 166% | 178% | 188% | 200% |
Example: Ironblade Darus’s Iron Kick goes from 122.5% ATK at level 1 to 245% at level 11.
What it costs
A Legendary’s active skill:
| To level | Gold |
 Rare Codex |
 Epic Codex |
Legendary Codex |
Damage added |
|---|---|---|---|---|---|
| 2 | 5,000 | 1 | 1 | +6% | |
| 3 | 10,000 | 1 | 1 | +6% | |
| 4 | 15,000 | 1 | 1 | 1 | +10% |
| 5 | 20,000 | 1 | 1 | 1 | +12% |
| 6 | 25,000 | 2 | 1 | 1 | +10% |
| 7 | 30,000 | 2 | 2 | 1 | +12% |
| 8 | 35,000 | 3 | 3 | 2 | +10% |
| 9 | 40,000 | 4 | 3 | 2 | +12% |
| 10 | 45,000 | 5 | 3 | 3 | +10% |
| 11 | 50,000 | 6 | 4 | 3 | +12% |
| Total | 275,000 | 26 | 20 | 14 | +100% |
- Ultimates and Combos: same gold, more Codex (48 Rare, 34 Epic, 24 Legendary in total).
- All five skills on one Legendary: 1,375,000 gold, 174 Rare, 128 Epic and 90 Legendary Codex.
- Epics: 137,500 gold per skill, at most 2 Legendary Codex per level. Rares never need Legendary Codex.
Gold per 1% of damage climbs from about 830 at level 2 to over 4,000 at levels 10 and 11. To see what your own box still needs, use the Planner.
Numbers for game version 0.61.1516.