What makes a good Quartermaster in CK3?

Employer has Local Inspection Perk +10, Employer has Positions Of Power Perk (Friend) +5, Stewardship Skill Stewardship × 2.5 (max 60), Generous -20, Logistician +20, Greedy +10, Avaricious +20, Administrator +20, Profligate -50 and Improvident -50 (the game's aptitude breakdown, patch 1.20.0.3).

What does the Quartermaster give?

Terrible: Supply Capacity +10%, Provisions Loss -10%; Poor: Supply Capacity +15%, Provisions Loss -15%; Average: Supply Capacity +25%, Provisions Loss -25%; Good: Supply Capacity +30%, Provisions Loss -30%; Excellent: Supply Capacity +50%, Provisions Loss -50%.

Camp officers (landless adventurers)

Quartermaster

Roads to Power

Quartermaster is a camp officer in Crusader Kings III; its aptitude rests on Stewardship. At excellent aptitude it gives Supply Capacity +50%, Provisions Loss -50%. Aptitude also comes from Employer has Local Inspection Perk (+10), Employer has Positions Of Power Perk (Friend) (+5) and Logistician (+20). It needs Roads to Power. Patch 1.20.0.3, from game/common/court_positions/types/00_camp_officers.txt.

Quick answers (2)

What makes a good Quartermaster in CK3?: Employer has Local Inspection Perk +10, Employer has Positions Of Power Perk (Friend) +5, Stewardship Skill Stewardship × 2.5 (max 60), Generous -20, Logistician +20, Greedy +10, Avaricious +20, Administrator +20, Profligate -50 and Improvident -50 (the game's aptitude breakdown, patch 1.20.0.3).
What does the Quartermaster give?: Terrible: Supply Capacity +10%, Provisions Loss -10%; Poor: Supply Capacity +15%, Provisions Loss -15%; Average: Supply Capacity +25%, Provisions Loss -25%; Good: Supply Capacity +30%, Provisions Loss -30%; Excellent: Supply Capacity +50%, Provisions Loss -50%.

The Quartermaster is responsible for ensuring the camp is well fed and watered. They manage, safeguard, and distribute the provisions as needed.

What it gives you, by aptitude

The holder's aptitude (see below) sets the level: levels start at 20, 40, 60, 80.

Terriblebelow 20
- Supply Capacity+10%
- Provisions Loss-10%
Poor20+
- Supply Capacity+15%
- Provisions Loss-15%
Average40+
- Supply Capacity+25%
- Provisions Loss-25%
Good60+
- Supply Capacity+30%
- Provisions Loss-30%
Excellent80+
- Supply Capacity+50%
- Provisions Loss-50%

What makes a good Quartermaster

The game's own aptitude breakdown for this position — every part it adds up:

Part	Aptitude
Employer has Local Inspection Perk	+10
Employer has Positions Of Power Perk (Friend)	+5
Stewardship Skill	Stewardship × 2.5 (max 60)
Generous	-20
Logistician	+20
Greedy	+10
Avaricious	+20
Administrator	+20
Profligate	-50
Improvident	-50

The holder gets

Prestige+0.1/month

Who may hire it (valid_position) (13 lines of game script)

custom_tooltip = {
	text = landless_government_tt
	government_has_flag = government_is_landless_adventurer
}
OR = {
	custom_tooltip = {
		text = quartermaster_camp_officer_parameter_tt
		domicile ?= {
			has_domicile_parameter = camp_unlocks_quartermaster_officer
		}
	}
	has_perk = local_inspection_perk
}

As written in game/common/court_positions/types/00_camp_officers.txt.

Who may hold it (valid_character) (3 lines of game script)

valid_camp_officer_trigger = {
	OFFICER = quartermaster
}

As written in game/common/court_positions/types/00_camp_officers.txt.

Shown when (is_shown) (5 lines of game script)

has_ep3_dlc_trigger = yes
custom_tooltip = {
	text = landless_government_tt
	government_has_flag = government_is_landless_adventurer
}

As written in game/common/court_positions/types/00_camp_officers.txt.

Source: game/common/court_positions/types/00_camp_officers.txt, common/court_positions/tasks, common/script_values and the English localisation, Crusader Kings III 1.20.0.3. Salary is the base before the realm-size and cultural-era multipliers.