What counters Jomsviking Pirates?

Skirmishers is countered by Archer Cavalry, Archers and Elephant Cavalry (patch 1.20.0.3).

Skirmishers men-at-arms

Jomsviking Pirates

Damage: 30
Toughness: 30
Pursuit: 40
Screen: 40

jomsviking_pirates

Jomsviking Pirates are skirmishers men-at-arms in Crusader Kings III: damage 30, toughness 30, pursuit 40, screen 40, 100 soldiers per sub-regiment. A sub-regiment costs 63 gold to buy, 0.63 gold a month raised and 0.21 at rest. They counter Heavy Infantry and Archers. They come only from events. Patch 1.20.0.3, from game/common/men_at_arms_types/01_fp1_maa_types.txt.

Quick answers (4)

What are the stats of Jomsviking Pirates in CK3?: Damage 30, toughness 30, pursuit 40, screen 40, 100 soldiers per sub-regiment (patch 1.20.0.3).
What do Jomsviking Pirates counter?: Heavy Infantry and Archers.
What counters Jomsviking Pirates?: Skirmishers is countered by Archer Cavalry, Archers and Elephant Cavalry (patch 1.20.0.3).
How do you get Jomsviking Pirates?: They come only from events.

Some of the most notorious reavers ever to ply the Baltic, the Jomsvikings excel at injecting chaos into battle, drawing it out before excelling in the aftermath.

Counters

Countering cuts the countered regiment's damage by up to 90%: full effect at 2 effective countering sub-regiments per countered one (NCombat defines).

Jomsviking Pirates counters

Heavy Infantry×1
Archers×1

Countered by (Skirmishers)

Put Jomsviking Pirates in the counters calculator →

Terrain and winter

In Normal Winter	+8 damage, +8 pursuit
In Harsh Winter	+8 damage, +8 pursuit

How to get it

Only from events or scripts (special_recruit_only)

Upgrades

Bonuses in the files that raise this regiment or every Skirmishers regiment.

innovation · Grenades

Damage+6
Toughness+2
Screen+5

innovation · Lacquered Armor

Toughness+2

tradition · Hit-and-Run Tacticians

Skirmisher Damage+20%
Skirmisher Screen+25%

tradition · Adaptive Skirmishers

tradition · Konni Raids

Skirmisher Screen+20%

tradition · Polders

Skirmisher Damage+20%
Skirmisher Screen+20%

tradition · Pragmatic Creed

Skirmisher Toughness+10%
Skirmisher Maintenance-15%

building · Archery Grounds (top level: Marksman's Ranges)

building · Nomadic Settlement (top level: Nomadic Settlement)

building · Forestry (top level: Sawmills)

Stationed Skirmishers Damage+28%

building · Hill Farms (top level: Apple Orchards)

Stationed Skirmishers Toughness+4%

building · Forest Forts (top level: Forest Fortresses)

building · Hill Forts (top level: Complex Earthworks)

building · Workshops (top level: Powderhouses)

Stationed Skirmishers Damage+70%
Skirmisher Maintenance-7.2%

building · Warrior Lodges (top level: Visitors Quarters)

building · Militia Camps (top level: Levying Squares)

building · Outposts (top level: Fortified Outposts)

building · War Camps (top level: Warrior Lodges)

building · Kora-Kora Yards (top level: Great War-Canoe Arsenal)

building · Subak Water-Temples (top level: Great Water-Temple Landscape)

building · Stilted Granaries (top level: Granary Ward)

Source: game/common/men_at_arms_types/01_fp1_maa_types.txt, game/common/script_values/00_men_at_arms_values.txt and the English localisation, Crusader Kings III 1.20.0.3.