Weapon Parameter Modding

Weapon Parameter file structure

8 byte header, with the first 4 bytes being 46 55 50 00 and the rest being 02 00 00 00.
All files are located in Romfs\nativeNX\arc\player\quest\wXX.arc\player\param
Despite the game running at 30fps natively, all durations are saved as if it were running at 60fps. So a duration in frames of 600 is equal to 10s and not 20s.

Greatsword Parameters (w00)

Offset	Length	Parameter
+76/80/84	float32	Lions Maw I/II/III damage modifier
+140/144/148	float32	Brimstone Slash frames to charge level 1/2/3
+152	float32	Brimstone Slash max charge time
+156	float32	Brimstone Slash striker charge modifier (higher value means lower charge time)

Sword and Shield Parameters (w01)

Offset	Length	Parameter
+20	byte	Chaos Oil + Minds Eye Oil sharpness restoration
+48/52/56	float32	Chaos Oil I/II/II duration in frames
+72/76/80/84	float32	Affinity Oil effect
+88/92/96/100	float32	Stamina Oil Exhaust effect
+104/108/112/116	float32	Stamina Oil KO effect
+120/124/128/132	float32	Destroyer Oil effect

The Offsets for Single Oils refer to: Chaos Oil I/II, Chaos Oil III, Regular and stack with Chaos Oil I/II, and stack with Chaos Oil III

Hammer Parameters (w02)

Offset	Length	Parameter
+72/76/80	float32	Provoke I/II/III duration in seconds
+88	float32	Provoke defense boost
+92/96/100	float32	Impact Press duration in frames

Lance Parameters (w03)

Offset	Length	Parameter
+68/72/76	float32	Enraged Guard duration in frames
+84/88/92	float32	Enraged Guard raw modifier
+96/100/104	float32	Healing Shield duration in frames

Heavy Bowgun Parameters (w04)

Offset	Length	Parameter
+32/36/40	byte	Gunpowder Infusion amount
+84	float32	Gunpowder Infusion raw modifier
+88/92/96	float32	Guns Blazing duration in frames
+112	float32	Adept Power Reload duration in frames
+116	float32	Valor Power Reload duration in frames
+128	float32	Valor Siege max speed
+132	float32	Valor Siege ramp up speed
+136	float32	Valor Siege initial speed
+140	float32	Valor Power Reload valor gauge generation modifier
+148	float32	Aerial Power Reload duration in frames
+172	float32	Power Reload raw modifier

Light Bowgun Parameters (w06)

Offset	Length	Parameter
+28/32/36	byte	Rapid Fire Rain number of shots
+40/44/48	byte	Charge Shot number of shots
+64	float32	Adept Power Reload duration in frames
+172	float32	Valor Power Reload valor gauge generation modifier
+192	float32	Aerial Power Reload duration in frames

Long Sword Parameters (w07)

Offset	Length	Parameter
+60/64/68	float32	Unhinged Spirit duration in seconds
+84/88/92	float32	Devouring Demon duration in seconds
+108/112/116	float32	Devouring Demon raw modifier
+156	float32	Valor Aura raw modifier

Switch Axe Parameters (w08)

Offset	Length	Parameter
+68/72/76	float32	Demon Riot duration (this value is reduced by 0.01 every frame, so every multiple of 6 adds 10s of duration)
+80/84/88	float32	Demon Riot effect
+116	float32	Tempest Axe move speed modifier
+136/140/144	float32	Tempest Axe duration in seconds
+148	float32	Power Phial raw modifier
+152	float32	Element Phial element modifier

Gunlance Parameters (w09)

Offset	Length	Parameter
+112	float32	Wyvernsfire cooldown
+118	float32	Wyvernsfire cooldown with artillery expert
+124	float32	Heat Gauge overheat cooldown
+132/136/140	float32	Dragon Breath duration in frames
+172/176/180/184/188	float32	Valor Rapid Shelling modifiers (Last value applies to both the 5th and 6th shellings)
+192/196/200/204/208/212	float32	Valor Full Burst modifiers

Following values are saved in pl_w09_000.496F8F22 (make sure it has that extension because there is another file with the same name but different extension), located in the arc\shell\pl\w09.arc\shell\pl\pl_w09_000 folder.

Offset	Length	Parameter
+20	float32	Long Wyvernsfire modifier
+24	float32	Wide Charged Shelling modifier
+28	float32	Normal and Long Charged Shelling modifier
+32	float32	Normal Full Burst modifier
+36	float32	Long Full Burst modifier
+40	float32	Wide Full burst modifier

Bow Parameters (w10)

Offset	Length	Parameter
+56/60/64	float32	Haste Rain duration in frames
+68/72/76	float32	Blade Wire duration in frames
+124/128	float32	Valor Power Shots modifiers
a+132/136/140/144	float32	Charge Valor generation modifier
+152/156/160/164	float32	Charge Alchemy generation modifier
+168/172/176	float32	Arc Shot raw modifier

Dual Blades Parameters (w11)

Offset	Length	Parameter
+140/144/148	float32	Wolf's Maw duration in frames
+164/168/172	float32	Wolf’s Maw additional strike damage

Hunting Horn Parameters (w12)

Offset	Length	Parameter
+32/36/40	float32	Harmonize duration in frames
+64/68/72	float32	Invigoration duration in frames

Insect Glaive Parameters (w13)

Offset	Length	Parameter
+32	float32	Red Extract duration
+36	float32	Orange Extract duration
+40	float32	White Extract duration
+44	float32	Triple Up duration
+52/56/60	float32	Swarm duration in frames
+68/72/76	float32	Extract Hunter Triple Up duration
+108/112/116	float32	Bug Majeure duration in frames

Charge Blade Parameters (w14)

Offset	Length	Parameter
+40	float32	Yellow Shield raw modifier
+44	float32	Non Striker Red Shield raw modifier
+48	float32	Striker Red Shield raw modifier
+52	float32	Blue Shield raw modifier
+96/100/104	float32	Limit Breaker duration in frames

Palico Parameters (w15)

Following values are saved in ot000_cmn, located in the arc\shellotl\com.arc\shell\otl\ot000 folder

Offset	Length	Parameter
+80	float32	Charged Boomerangs damage modifier
+96	float32	Piercing Boomerangs ailment modifier