Troll Cages Unbuildable?

[oou420]

Why is it impossible for evil factions like Mordor or Gundabad Orcs to build troll cages, and more importantly why has noone fixed something so obvious yet? The cages only appear in the city building browser when you select a castle, and vice versa; they never appear in the construction menu.

[Stylix]

Why is it impossible for evil factions like Mordor or Gundabad Orcs to build troll cages, and more importantly why has noone fixed something so obvious yet? The cages only appear in the city building browser when you select a castle, and vice versa; they never appear in the construction menu.

Troll cages can only be built after the historic event large_city_barracks has occured. In addition the province must have the hidden resource 'trolls'. Also trolls can only be built by OotMM, OoG and Mordor.

From EDB:
troll_cage requires factions { england, hre, portugal, } and event_counter large_city_barracks 1 and hidden_resource trolls