decrease of population problem

[GameExtremist]

With this enchantment, population living inside the Pretender's Dominion will quickly die and the carcasses will be reanimated by living plants. In forests, animals will be reanimated to join the forces of Pangaea when they die their natural deaths.

Quoted from the wiki spell description.

Basically as long as you have this global up, your population will die in friendly dominion.

Think of LA Ermors dominion effect.