Advance
Independence from Mali
For many years, we were a subject of Mali. As Mali's power has weakened, ours has grown, and we can now claim to be fully independent of Malian overlordship. Let us take steps to make sure we remain so.
SonghaiCountrypotentialAdvance tree
The game files don’t say where this goes: it has no requires, so the game places it in the 
Renaissance tree itself.
Modifiers
Fort Defense+20%
Definitionin_game/common/advances/country_SON.txt:29
34allow = {
35is_subject = no
}