would be very useful if someone could show me how to make factions become hordeable.
Maybe this can be of use to you.
simply change the entries in the desr_sm faction to look like how the vanillia did with the mongols but using units from the faction you wish to horde troops such as my example
faction england
culture northern_european
religion catholic
symbol models_strat/symbol_england.CAS
rebel_symbol models_strat/symbol_rebels.CAS
primary_colour red 215, green 0, blue 0
secondary_colour red 255, green 210, blue 0
loading_logo loading_screen/symbols/symbol128_england.tga
standard_index 12
logo_index FACTION_LOGO_ENGLAND
small_logo_index SMALL_FACTION_LOGO_ENGLAND
triumph_value 5
custom_battle_availability yes
horde_min_units 10
horde_max_units 20
horde_max_units_reduction_every_horde 10
horde_unit_per_settlement_population 250
horde_min_named_characters 2
horde_max_percent_army_stack 80
horde_disband_percent_on_settlement_capture 0
horde_unit Archer Militia
horde_unit Archer Militia
horde_unit Levy Spearmen
horde_unit Longbowmen
horde_unit Spear Militia
horde_unit Spear Militia
horde_unit Mailed Knights
can_sap no
prefers_naval_invasions no
can_have_princess yes
has_family_tree yes
this can be done for every faction baring the papal faction