How to make units "unique"?

[Metron]

In kingdoms crusade there were some units that were "unique" meaning that one can only have one of them at a time.
Is there any way to put this into the export_descr_unit file?

[Taiji]

I think you might have to script some stuff in campaign_script, or descr_strat, and you might want to do something in EDB. So no, it can't be done via EDU.

Give a better description of what you want exactly and I or someone else will explain how to get it.

[valvegas1]

You can do this with any unit with some simple scripting...You can use this a guidline script for each unit you want to be unique...Here's an example of the script to write in campaign_script file...Obviously you can change or add more unit's if desired....

;------------------- RECRUITMENT - UNIQUE UNITS -------------------;    

;Only one unique unit can exist at a time

;Jerusalem
    ;Marshall of the Templars
    ;Constable of Jerusalem
    
;Antioch
    ;Marshall of the Hospitallers
    ;Canons of the Holy Sepulcher

;Test if the unit doesn't exist at start of turn
    ;Increment event counter - allows recruitment
        
    set_event_counter no_templar_marshall 0
    set_event_counter no_jerusalem_constable 0
    set_event_counter no_hospitaller_marshall 0
    set_event_counter no_canon_sepluchre 0
    
    monitor_event FactionTurnStart FactionType jerusalem
        and I_EventCounter no_templar_marshall == 0
         and not I_UnitExists jerusalem Marshall of the Templars
        add_events
            event    counter    no_templar_marshall
             date    0
         end_add_events
     end_monitor

    monitor_event FactionTurnStart FactionType jerusalem
        and I_EventCounter no_jerusalem_constable == 0
         and not I_UnitExists jerusalem Constable of Jerusalem
        add_events
            event    counter    no_jerusalem_constable
             date    0
         end_add_events
     end_monitor

    monitor_event FactionTurnStart FactionType antioch
        and I_EventCounter no_hospitaller_marshall == 0
         and not I_UnitExists antioch Marshall of the Hospitallers
        add_events
            event    counter    no_hospitaller_marshall
             date    0
         end_add_events
     end_monitor

    monitor_event FactionTurnStart FactionType antioch 
        and I_EventCounter no_canon_sepluchre == 0
         and not I_UnitExists antioch Canons of the Holy Sepulcher
        add_events
            event    counter    no_canon_sepluchre
             date    0
         end_add_events
     end_monitor

;Test if the unit exists at start of turn
    ;Decrement event counter - stops recruitment
    
    monitor_event AddedToTrainingQueue UnitType Marshall of the Templars
        and I_EventCounter no_templar_marshall == 1
        set_event_counter no_templar_marshall 0
    end_monitor

    monitor_event AddedToTrainingQueue UnitType Constable of Jerusalem
        and I_EventCounter no_jerusalem_constable == 1
        set_event_counter no_jerusalem_constable 0
     end_monitor

    monitor_event AddedToTrainingQueue UnitType Marshall of the Hospitallers
        and I_EventCounter no_hospitaller_marshall == 1
        set_event_counter no_hospitaller_marshall 0
     end_monitor
     
    monitor_event AddedToTrainingQueue UnitType Canons of the Holy Sepulcher
        and I_EventCounter no_canon_sepluchre == 1
        set_event_counter no_canon_sepluchre 0
     end_monitor

And this is an example of what your entries in the EDB should look like;

recruit_pool "Constable of Jerusalem"  0   0.1   0.999  0   requires factions { jerusalem, }  and event_counter  no_jerusalem_constable 1 
recruit_pool "Marshall of the Hospitallers"  0   0.1   0.999  0   requires factions { antioch, }  and event_counter  no_hospitaller_marshall 1
recruit_pool "Marshall of the Templars"  0   0.1   0.999  0  requires  factions { jerusalem, }  and event_counter no_templar_marshall 1 
recruit_pool "Canons of the Holy Sepulcher"  0   0.1   0.999  0   requires factions { antioch, }  and event_counter no_canon_sepluchre 1

[Vegas_Bear]

I think he is referring to the 'unique_unit' attribute for the unit in the EDU. Example from Crusades -

Spoiler Alert, click show to read: 

type Constable of Jerusalem
dictionary Constable_of_Jerusalem ; Constable of Jerusalem
category cavalry
class heavy
voice_type Heavy
banner faction main_cavalry
banner holy crusade_cavalry
soldier Constable_of_Jerusalem, 48, 0, 1
mount mailed horse
mount_effect elephant -4, camel -4
attributes sea_faring, hide_forest, hardy, can_withdraw, can_formed_charge, knight, unique_unit
formation 2, 4.4, 3, 6, 3, square, wedge
stat_health 1, 0
stat_pri 11, 7, no, 0, 0, melee, melee_blade, piercing, spear, 25, 1
;stat_pri_ex 0, 0, 0
stat_pri_attr no
stat_sec 12, 3, no, 0, 0, melee, melee_blade, blunt, mace, 25, 1
;stat_sec_ex 0, 0, 0
stat_sec_attr ap
stat_pri_armour 6, 5, 6, metal
;stat_armour_ex 6, 0, 0, 0, 5, 6, 4, metal
stat_sec_armour 0, 0, flesh
stat_heat 7
stat_ground 0, -2, -10, 2
stat_mental 11, impetuous, highly_trained
stat_charge_dist 45
stat_fire_delay 0
stat_food 60, 300
stat_cost 1, 1380, 375, 115, 270, 1380, 1, 410
armour_ug_levels 3
armour_ug_models Constable_of_Jerusalem
ownership jerusalem
era 0 jerusalem
era 1 jerusalem
;unit_info 11, 0, 17
recruit_priority_offset 35

I hope this is what you were looking for,

VB