What makes a good Chief Eunuch in CK3?

Diplomacy Skill Diplomacy × 2.5 (max 50), Intrigue Skill Intrigue × 2.5 and Learning the Ropes +10 (the game's aptitude breakdown, patch 1.20.0.3).

What does the Chief Eunuch give?

Terrible: Enemy Hostile Scheme Phase Length 1 days slower per Scheme Phase, Hostile Scheme Phase Length 1 days faster per Scheme Phase; Poor: Court grandeur baseline +1, Enemy Hostile Scheme Phase Length 2 days slower per Scheme Phase, Hostile Scheme Phase Length 2 days faster per Scheme Phase; Average: Court grandeur baseline +1, Enemy Hostile Scheme Phase Length 4 days slower per Scheme Phase, Hostile Scheme Phase Length 3 days faster per Scheme Phase; Good: Court grandeur baseline +2, Enemy Hostile Scheme Phase Length 8 days slower per Scheme Phase, Hostile Scheme Phase Length 5 days faster per Scheme Phase; Excellent: Court grandeur baseline +2, Enemy Hostile Scheme Phase Length 16 days slower per Scheme Phase, Hostile Scheme Phase Length 7 days faster per Scheme Phase.

What tasks can the Chief Eunuch do?

Fuel the Rumor Mill and Keep an Ear to the Ground.

Royal court

Chief Eunuch

Chief Eunuch is a court position in Crusader Kings III; its aptitude rests on Diplomacy. At excellent aptitude it gives Court grandeur baseline +2, Enemy Hostile Scheme Phase Length 16 days slower per Scheme Phase, Hostile Scheme Phase Length 7 days faster per Scheme Phase. Aptitude also comes from Learning the Ropes (+10). Base salary 0.05 a month; revoking it costs 200 prestige. Patch 1.20.0.3, from game/common/court_positions/types/00_court_positions.txt.

Quick answers (3)

What makes a good Chief Eunuch in CK3?: Diplomacy Skill Diplomacy × 2.5 (max 50), Intrigue Skill Intrigue × 2.5 and Learning the Ropes +10 (the game's aptitude breakdown, patch 1.20.0.3).
What does the Chief Eunuch give?: Terrible: Enemy Hostile Scheme Phase Length 1 days slower per Scheme Phase, Hostile Scheme Phase Length 1 days faster per Scheme Phase; Poor: Court grandeur baseline +1, Enemy Hostile Scheme Phase Length 2 days slower per Scheme Phase, Hostile Scheme Phase Length 2 days faster per Scheme Phase; Average: Court grandeur baseline +1, Enemy Hostile Scheme Phase Length 4 days slower per Scheme Phase, Hostile Scheme Phase Length 3 days faster per Scheme Phase; Good: Court grandeur baseline +2, Enemy Hostile Scheme Phase Length 8 days slower per Scheme Phase, Hostile Scheme Phase Length 5 days faster per Scheme Phase; Excellent: Court grandeur baseline +2, Enemy Hostile Scheme Phase Length 16 days slower per Scheme Phase, Hostile Scheme Phase Length 7 days faster per Scheme Phase.
What tasks can the Chief Eunuch do?: Fuel the Rumor Mill and Keep an Ear to the Ground.

The Chief Eunuch is a trusted servant responsible for the eunuchs at court. Not much goes on that they don't hear about, both among the servants and the royals.

What it gives you, by aptitude

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

Terriblebelow 20
- Enemy Hostile Scheme Phase Length1 days slower per Scheme Phase
- Hostile Scheme Phase Length1 days faster per Scheme Phase
Poor20+
- Court grandeur baseline+1
- Enemy Hostile Scheme Phase Length2 days slower per Scheme Phase
- Hostile Scheme Phase Length2 days faster per Scheme Phase
Average40+
- Court grandeur baseline+1
- Enemy Hostile Scheme Phase Length4 days slower per Scheme Phase
- Hostile Scheme Phase Length3 days faster per Scheme Phase
Good60+
- Court grandeur baseline+2
- Enemy Hostile Scheme Phase Length8 days slower per Scheme Phase
- Hostile Scheme Phase Length5 days faster per Scheme Phase
Excellent80+
- Court grandeur baseline+2
- Enemy Hostile Scheme Phase Length16 days slower per Scheme Phase
- Hostile Scheme Phase Length7 days faster per Scheme Phase

What makes a good Chief Eunuch

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

Part	Aptitude
Diplomacy Skill	Diplomacy × 2.5 (max 50)
Intrigue Skill	Intrigue × 2.5
Learning the Ropes	+10

The holder gets

Tasks

Fuel the Rumor Mill
This character will spend their time spreading nonsensical rumors and misleading stories to slow down enemy schemes.
- Hostile scheme success chance growth+0.5%
- Political scheme success chance growth+0.5%
- General Opinion-5
Costs 0.05 prestige a month
Keep an Ear to the Ground
This character will spend their time hiding behind curtains, listening intently for rumors and gossip.
Costs 0.05 prestige a month

Other rooms and names

Some governments and cultures call it Palace Attendant, Eunuch Attendant.

The game picks the room by the ruler's government or culture.

Who may hire it (valid_position) (9 lines of game script)

OR = {
	is_landed_or_landless_administrative_or_theocratic = yes
	government_has_flag = government_is_nomadic
}
highest_held_title_tier >= tier_duchy
save_temporary_scope_as = root_scope
can_employ_court_eunuchs_trigger = {
	CHAR = scope:root_scope
}

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

Who may hold it (valid_character) (6 lines of game script)

scope:employee = {
	liege ?= scope:liege
	chief_eunuch_validity_trigger = {
		EMPLOYER = scope:liege
	}
}

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

Shown when (is_shown) (11 lines of game script)

OR = {
	is_landed_or_landless_administrative_or_theocratic = yes
	government_has_flag = government_is_nomadic
}
trigger_if = {
	limit = {
		is_ai = yes
		highest_held_title_tier <= tier_county
	}
	always = no
}

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

Source: game/common/court_positions/types/00_court_positions.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.