Last Argument

Last Argument
Type	Ranged weapon
Effects	Impact Damage Tear Explosive Damage Plasma Damage
Perks	Damage Over Time Instant Brittle Chance Overdraw Damage Knockdown Power Stealth Damage
Mod Slots	3 (5 after upgrades)
Source	Complete A Friend in the Dark
Cost to buy	N/A
Value when sold	1000
Ammunition
Shot Type Group	Spike
Shot Type	Advanced Explosive Spike Drill Spike Plasma Spike

"From Stormbirds to Thunderjaws, let no threat go unchallenged with this mighty Oseram weapon. Reserved for only the greatest of machine hunters."

―Inventory description

Last Argument is a legendary weapon in Horizon Forbidden West. It serves as a version of the Spike Thrower in the Burning Shores DLC.

By default, it deals 15% more damage over time and has a 2% chance to instantly inflict the Brittle state on enemies.

It can be upgraded five times.

Acquisition details

This weapon is automatically obtained from Gildun upon completion of A Friend in the Dark.

Ammo

	Advanced Explosive Spike		Drill Spike		Plasma Spike
	Damage	Explosive Damage	Damage	Tear	Plasma Damage	Plasma Buildup
Base	77	271	121	220	154	110
Level 1	81	282	126	230	161	115
Level 2	84	293	131	243	168	121
Level 3	87	305	136	260	175	130
Level 4	93	327	146	278	189	139
Level 5	103	361	161	300	210	150

Upgrade costs

Upgrade	Cost	Unlocks
Level 1	600 1 Luminous Brainstem	Increased damage/tear/buildup Perk: Overdraw Damage +15%
Level 2	800 2 Clamberjaw Circulator 1 Luminous Brainstem	Increased damage/tear/buildup Fourth coil unlocked Perk: Damage Over Time +40%
Level 3	1000 1 Brimshine 2 Luminous Brainstem 2 Waterwing Circulator	Increased damage/tear/buildup Perk: Instant Brittle Chance +4% Perk: Knockdown Power +10%
Level 4	1200 2 Brimshine 2 Luminous Brainstem 2 Widemaw Circulator	Increased damage/tear/buildup Perk: Knockdown Power +25% Perk: Stealth Damage +15%
Level 5	1500 1 Apex Slitherfang Heart 3 Brimshine 3 Luminous Brainstem	Increased damage/tear/buildup Fifth coil unlocked Perk: Stealth Damage +25%