Merit ranks

Nine titles from Slug to Imperator. Your title rises with the Merits you hold, and higher titles let more faction NPCs follow your pings. Titles reset with seasons and wipes.

Title	Merits needed	NPC capacity	Authority
Imperator	2,000,000	All	8 / 8
Exarch	800,000	5	7 / 8
Praetor	400,000	4	6 / 8
Commander	200,000	3	5 / 8
Knight	100,000	2	4 / 8
Sergeant	50,000	2	3 / 8
Legionary	25,000	1	2 / 8
Recruit	10,000	1	1 / 8
Slug	0	0	0 / 8

Rank badges on this site

Names show the holder's current rank from their Citadel Discord roles, faction first: "Ganden Commander", "Tzhal Praetor". Pips count up from Recruit to Praetor; Exarch has laurels, Imperator laurels and a star. Green is Ganden, tan is Tzhal. A Tzhal Praetor and a Ganden Praetor are the same level.

Command: Citadel developers and admins, above the whole ladder.

Sources: the in-game title ladder (Beta 1); Citadel Wiki, Merits (same merits and NPC counts; the wiki writes "No limit" for Imperator). Authority isn't on the wiki. See also the answer.