Optimal skill tree priority: Health Pool I (200 souls) → Parry Window+ (500) → Issen Mastery (500) → Health Pool II (500) → Parry Window++ (1,000) → Issen Mastery II (1,000) → Oni Awakening (special). Total: 53 Power Stones + 54 Oni Stones for max build.
1. Resource Budget
The skill tree operates on two distinct currencies. Power Stones unlock and upgrade combat skills. Oni Stones unlock Oni-mode abilities. They're not in-game currency — they're special items found through exploration and boss rewards.
2. Early Priority (First 5,000 Souls)
The first five skills set the foundation for the entire run. Spending souls in the wrong order at this stage is the most common reason players hit mid-game walls.
Health Pool I 200 Souls+15% Max HP
Reason: Universal defensive upgrade — cheapest in the game, longest-lasting impact. Every fight benefits. Survive longer, fewer deaths.
Parry Window+ 500 Souls+20% parry window
Reason: Foundation of all combat. Easier Deflect and Parry timing — both flow into Issen chains and Break Issen openings.
Issen Mastery 500 Souls+15% perfect Issen damage
Reason: Maximum damage potential on every perfect Issen. Boss-killing burst damage starts here.
Rapid Charge 500 SoulsFaster heavy attack charge
Reason: Versatile utility. Faster heavy attack charge means better stance control and quicker reactions to boss openings.
Reserve the remaining ~3,000 Souls for emergency upgrades — boss-specific skills that solve a wall you've just hit.
3. Mid Priority (5,000-50,000 Souls)
Once the foundation is set, these upgrades extend your defensive buffer and offensive ceiling.
Health Pool II 500 Souls+15% Max HP
Reason: Stacks with Tier 1 for a 30% Max HP buffer. Mandatory for Carnage survivability.
Parry Window++ 1,000 SoulsFurther +20% parry window
Reason: Forgiving parry on Carnage. Stacks with Parry Window+ for a 40% combined window — almost impossible to mistime.
Issen Mastery II 1,000 Souls+15% more Issen damage
Reason: Boss-killing burst damage. Combined with Issen Mastery, every perfect Issen hits for 30% more.
Stance Speed 500 SoulsFaster stance switching
Reason: Quality-of-life upgrade for stance-switching playstyles. Lets you swap between High/Mid/Low stances without losing tempo.
Sword Damage I 200 Souls+10% damage
Reason: Cheap damage upgrade. Pairs well with Fencer's Strength Charm for compounding gains.
4. Late Priority (Max Build)
Once the foundation and mid-tier are done, the remaining skills unlock the build's full potential. These are the expensive, soul-heavy upgrades that close out a max build.
| Step | Skill | Unlock Cost | Soul Cost |
|---|---|---|---|
| 10 | Reflex Combo (unlock) | 2 Power Stones | — |
| 11 | Reflex Combo Power 1 | — | 4,500 Red Souls |
| 12 | Chain Issen (unlock) | 2 Power Stones | — |
| 13 | Issen Power 1 | — | 4,500 Red Souls |
| 14 | Chain Issen Reach 1 | 3 Power Stones | — |
| 15 | Chain Issen Reach 2 | 3 Power Stones | — |
| 16 | Issen Power 2 | — | 6,500 Red Souls |
| 17 | Oni Vision: Treasures (unlock) | 2 Oni Stones | — |
| 18 | Oni Vision: Treasures 2 | 2 Oni Stones | (requires 1st gate) |
| 19 | Oni Vision: Search Range | — | 5,500 Red Souls |
| 20 | Soul Absorption Yield 1 | — | 5,500 Red Souls |
| 21 | Charm Capacity 1 | 2 Power Stones | (requires 1st gate) |
| 22 | Charm Capacity 2 | 3 Power Stones | (requires 3rd gate) |
5. Oni Awakening Path
Oni Awakening is the transformation that turns you into a full Oni for a short duration. Unlocking it is the single most expensive Power Stone purchase — but it's the gate to every other Oni-mode ability.
- Unlock Oni Awakening from the main tree first. It's the prerequisite for every Oni-mode skill.
- Awakening gauge fills as you land deflects and chain attacks. Once full, transform.
- Time-saving: Save Awakening for tough moments (mid-boss phase transitions, low-HP emergencies). Don't waste it on trash mobs.
6. Skill Synergies
Some skills stack multiplicatively when paired. The synergies below define the build's core loops.
7. Common Mistakes to Avoid
Prioritize the core 3 (Health Pool, Parry Window, Issen Mastery) first. Spreading souls across many skills at low levels leaves you without any meaningful upgrade — and a mid-game wall that's harder to climb out of.
Health Pool is the cheapest and most impactful upgrade in the entire skill tree. Skipping it because you want to "save souls for damage" is the single most common mistake new players make.
Oni Vision: Treasures + Search Range saves hours of searching. Skip them and you'll spend 10+ extra hours combing every chapter for collectibles you can't see on the minimap.
Charm Capacity 1 + 2 unlock the build slots you need to run a full Carnage loadout. Skip them and you'll spend the final boss fight picking which Charm to leave behind — usually a fatal mistake on NG+.
8. Final Tip — Build Around Your Charm Set
Skills and Charms are designed to complement each other. Once you've maxed both, your build should feel like a single coherent set rather than two independent progressions. For the matching Charm priority order, see the All Builds Guide.