Hero synthesis and reload
Make your heroes stronger in the Ashurbanipal Library. Synthesis raises base stats; a reload gives a hero new skills.
Synthesis deletes the material hero. A reload cannot be undone.
Guide reviewed · October 23, 2026
The Ashurbanipal Library
All hero ascension is done in the Ashurbanipal Library. In Rotten Hill, go into the Magic Shop and take the portal to the 2nd floor.
| NPC | What they do | Guide |
|---|---|---|
| Gatekeeper Chavakiah | Hero Synthesis: +1 base stat | This page |
| Gatekeeper Lelahel | Hero Reload: new hero and skills | This page |
| Gatekeeper Seheiah | Succession: turn a hero into a succession hero | Succession, runes and gems |
| Gatekeeper Omael | Craft Skill Runes | Skill runes |
See Rotten Hill for the map.
These actions cannot be undoneSynthesis deletes the material hero, and a reload replaces your hero and skills. Check the hero you picked before you confirm.
Hero Synthesis
Synthesis combines two NFT heroes with the same base stat total. The target hero gets +1 base stat; the material hero is used up.
- Talk to Gatekeeper Chavakiah and tap Synthesis.
- 1. Select Target NFT: the hero you want to keep.
- 2. Select Material NFT: a hero with the same base stat total.
- Check the cost and tap Synthesis.
| Base stat total | Cost |
|---|---|
| 15 → 16 |  8,880,000 Gold |
| 16 → 17 | 8,880,000 Gold |
| 17 → 18 | 8,880,000 Gold |
| 18 → 19 | 8,880,000 Gold |
| 19 → 20 | 8,880,000 Gold |
| 20 → 21 | 8,880,000 Gold +  God’s Breath ×10 |
- Synthesis always succeeds. The highest base stat total is 21.
- The two heroes do not have to be the same hero. Only the base stat total must match.
- There is no level requirement.
- Trial Heroes, rented heroes, and heroes on sale, for rent or waiting after a transfer cannot be used.
- Your equipped hero can be the target, but not the material.
Base stat total is explained in Hero level and stats.
Hero Reload
A hero reload gives your hero a new hero type and new skills, picked at random with the same chances as a summon. Its level and base stats stay the same.
- Talk to Gatekeeper Lelahel and tap Hero.
- Choose the hero, then Normal or Special.
- Tap Reload.
| Normal | Special | |
|---|---|---|
| Cost | Legendary Scroll ×1, Broken Power ×20, 5,000 Gold | Hero – Special Reload ×1 |
| Skill levels | Go back to Lv.1 | Kept |
| Hero type and skills | Picked again at random | Picked again at random |
| Level and base stats | Kept | Kept |
Reload a succession hero
Tap Succession at Lelahel to reload a succession hero. There are three kinds:
| Reload | Cost | What changes |
|---|---|---|
| Normal | Legendary Scroll ×2, Broken Power ×30, 10,000 Gold | Succession hero, Succession Skill and rune slots. Succession Skill goes back to Lv.1 |
| Special | Succession – Special Reload ×1 | Succession hero and Succession Skill. Skill level and rune slots kept |
| Rune slots only | Succession – Rune Slot Reload ×1 | Only the 4 rune slots |
- The first two skills from the original hero are kept.
- Equipped skill runes go back to your inventory for free. If your rune inventory (180) is full, the reload stops before anything is used.
- The new Succession Skill is always different from the one you had.
- Hero – Special Reload, Succession – Special Reload and Succession – Rune Slot Reload are sold in the Item Shop’s XTO and X Point tabs. Legendary Scroll is in the XTO tab.
- Trial Heroes and rented heroes cannot be reloaded.