Fatal Knife
フェイタルナイフ
★★★★ 4★
Gun
Wonder
Unravel
Gun
Wonder
Unravel
Fatal Knife in 10 seconds
Fatal Knife is a 4★ weapon — Wonder.
Skill
Unravel
Refine +0For each Persona equipped, increase Attack by 5.0%.
Refine +5 (max)For each Persona equipped, increase Attack by 8.8%.
Stats
| HP | ATK | DEF | |
|---|---|---|---|
| Level 1 | 115 | 32 | 21 |
| Level 80 (max breach) | 1,427 | 396 | 264 |
| Per level | +12.96 | +3.6 | +2.4 |
Bars compare against the strongest P5X weapon (799 ATK · 2,873 HP · 537 DEF at max level).
Breach & materials
| HP | ATK | DEF | Material | |
|---|---|---|---|---|
| Tier 1 | +41.14 | +11.43 | +7.62 | Blue Crystal ×5 |
| Tier 2 | +41.14 | +11.43 | +7.62 | Blue Crystal ×12 |
| Tier 3 | +41.14 | +11.43 | +7.62 | Purple Crystal ×6 |
| Tier 4 | +41.14 | +11.43 | +7.62 | Purple Crystal ×10 |
| Tier 5 | +41.14 | +11.43 | +7.62 | Purple Crystal ×18 |
| Tier 6 | +41.14 | +11.43 | +7.62 | Yellow Crystal ×12 |
| Tier 7 | +41.14 | +11.43 | +7.62 | Yellow Crystal ×24 |
Named breach-material table for every one of the 7 tiers (cross-checked against the official dump — community sources do not list this level of detail).
How to obtain
Weapon-selection voucher / 5★ selection box exchange
Weapon mechanics (applies to every P5X weapon)
Weapons are hard-locked to one character — they cannot be swapped to another character.
Weapon level is SHARED: leveling up any one weapon raises the level of every other weapon owned by that same character, regardless of rarity. Level cap is 80, reached via 7 breach overclocks using crystals (Blue/Purple/Yellow).
Forging is NOT shared — each weapon forges independently. Even-numbered forge steps (0/2/4/6) need a duplicate of the exact same weapon; odd-numbered steps (1/3/5) accept any weapon of the same rarity.
Exclusive owner
More Wonder weapons
Frequently asked questions
Who wields Fatal Knife in P5X?
Fatal Knife is exclusively equipped by Wonder and cannot be transferred to another character.
How do I get Fatal Knife?
Weapon-selection voucher / 5★ selection box exchange
What materials does Fatal Knife need to breach?
All 7 breach tiers to Lv.80 need 17× Blue Crystal, 34× Purple Crystal, 36× Yellow Crystal.
Is Fatal Knife worth upgrading?
Weapon level is shared with every weapon owned by the same character (no extra cost there), but forging is per-weapon — worth it mainly if you actively use this character.