AdvanceChanged this version
Ceremonial Haka
The ground shakes as our warriors perform the Haka, their fierce cries and synchronized movements echoing across the battlefield. This intimidating ceremonial war dance emboldens the heart of every warrior, granting a significant morale boost to land forces.
Advance tree
The game files don’t say where this goes: it has no requires, so the game places it in the 
Traditions tree itself.
Modifiers
Army Morale+20%
Definitionin_game/common/advances/culture_maori.txt:13
15potential = {
16OR = {
}
}
22ai_weight = {
22add = 10
}