What makes a good Head Groom in CK3?

Employer has Positions Of Power Perk (Friend) +5, Learning Skill Learning (max 50), Stewardship Skill Stewardship × 1.3 (max 50), Brave +5, Lifestyle Herbalist +5, Lifestyle Hunter +5, Diligent +5, Lifestyle Traveler +20 to +40, Beastmaster +30, Craven -20 and Lazy -10 (the game's aptitude breakdown, patch 1.20.0.3).

What does the Head Groom give?

Terrible: Travel Speed +5; Poor: Travel Speed +5, Army Movement Speed +10%; Average: Travel Speed +10, Army Movement Speed +15%; Good: Travel Speed +10, Army Movement Speed +20%; Excellent: Travel Speed +15, Army Movement Speed +25%.

Camp officers (landless adventurers)

Head Groom

Roads to Power

Head Groom is a camp officer in Crusader Kings III; its aptitude rests on Stewardship. At excellent aptitude it gives Travel Speed +15, Army Movement Speed +25%. Aptitude also comes from Employer has Positions Of Power Perk (Friend) (+5), Brave (+5) and Lifestyle Herbalist (+5). 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 Head Groom in CK3?: Employer has Positions Of Power Perk (Friend) +5, Learning Skill Learning (max 50), Stewardship Skill Stewardship × 1.3 (max 50), Brave +5, Lifestyle Herbalist +5, Lifestyle Hunter +5, Diligent +5, Lifestyle Traveler +20 to +40, Beastmaster +30, Craven -20 and Lazy -10 (the game's aptitude breakdown, patch 1.20.0.3).
What does the Head Groom give?: Terrible: Travel Speed +5; Poor: Travel Speed +5, Army Movement Speed +10%; Average: Travel Speed +10, Army Movement Speed +15%; Good: Travel Speed +10, Army Movement Speed +20%; Excellent: Travel Speed +15, Army Movement Speed +25%.

The Head Groom is charged with the livery of the camp's horses and beasts of burden. They are responsible for the animal's provender, care, and tack.

What it gives you, by aptitude

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

Terriblebelow 20
- Travel Speed+5
Poor20+
- Travel Speed+5
- Army Movement Speed+10%
Average40+
- Travel Speed+10
- Army Movement Speed+15%
Good60+
- Travel Speed+10
- Army Movement Speed+20%
Excellent80+
- Travel Speed+15
- Army Movement Speed+25%

What makes a good Head Groom

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

Part	Aptitude
Employer has Positions Of Power Perk (Friend)	+5
Learning Skill	Learning (max 50)
Stewardship Skill	Stewardship × 1.3 (max 50)
Brave	+5
Lifestyle Herbalist	+5
Lifestyle Hunter	+5
Diligent	+5
Lifestyle Traveler	+20 to +40
Beastmaster	+30
Craven	-20
Lazy	-10

The holder gets

Prestige+0.1/month

Who may hire it (valid_position) (10 lines of game script)

custom_tooltip = {
	text = landless_government_tt
	government_has_flag = government_is_landless_adventurer
}
custom_tooltip = {
	text = head_groom_camp_officer_parameter_tt
	domicile ?= {
		has_domicile_parameter = camp_unlocks_head_groom_officer
	}
}

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 = head_groom
}

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.