- Skill tree
- Issen
- Upgrade cost
- 6,500 Red souls
- Full path cost
- 8 Power Stones + 11,000 Red souls
- Mission requirement
- Final hidden Oni power
- Unlock location
- Not yet verified for this hidden-power milestone.
- Activation
- Press Light attack or Heavy attack Just Before Being Hit
Reference tables
1 table
Unlock path
Buy these skills in order. Each row shows that skill's price; totals include the target and every earlier skill on this path.
| Step | Skill | Cost | Unlock requirement |
|---|---|---|---|
| 1 | Issen | No upgrade currency | During The Ruckus at Rendaino |
| 2 | Chain Issen | 2 Power Stones | The Oni's Apprentice |
| 3 | Issen Power 1 | 4,500 Red souls | A Strength in Refuge |
| 4 | Chain Issen: Chain Length 1 | 3 Power Stones | Hidden Oni power after A Strength in Refuge |
| 5 | Chain Issen: Chain Length 2 | 3 Power Stones | Final hidden Oni power |
| 6 | Issen Power 2 | 6,500 Red souls | Final hidden Oni power |