Culture
Mongol
set_culture mongolCulture ID mongol. set_culture changes the culture of the character you play; change_culture <county id> mongol changes a county's. Both need the debug mode (launch option -debug_mode).

Traditions
The traditions this culture starts with, and what each one does.
Prolific HuntersSocial+15% Travel Speed
Only the StrongWarfare+25% Men-at-Arms Recruitment Cost, +100% Knight Effectiveness, +2 Number of Knights, +20% Accolade Glory Gain, …
Hit-and-Run TacticiansWarfare+5% Nomadic Horde Damage, +5% Nomadic Horde Screen, +20% Skirmisher Damage, +25% Skirmisher Screen, …
Added with a DLC
- Wolves of the Deep Steppe with Khans Of The Steppe
Bellicose ethos
This culture considers conflict and violence to be necessary states of existence; ingrained in its people is the idea that one should stand up and fight for their own.
Martial custom: Men Only
- Only men can be Commanders and Knights
Other Mongolic cultures
Buryat, Kerait, Khitan, Naiman, Oirat, Öngüd, Shiwei, Tuyuhun
Source: game/common/culture/cultures/00_mongolic.txt, game/common/culture/traditions/00_societal_traditions.txt, game/common/culture/traditions/00_combat_traditions.txt, game/common/culture/pillars/00_ethos.txt, game/history/provinces (counties at the start) and the English localisation, Crusader Kings III 1.20.0.3.