In Heritage tab you can acquire more land using HP (Heritage Points). 1 HP can buy 20 land or forest or 10 mountains.

You can also spend HP to unlock research immediately.

These points will be renewed upon [[:abdication|abdications]] and [[:ascension|ascensions]]. The land acquired and research unlocked will be reset as well.

You earn HP through [[:abdication|abdications]] and [[:ascension|ascensions]] at certain populations. Note: It's the actual population which is used, max population is not taken into consideration.

Once the village have more than 50 population you will be awarded 1 xp for each additional villager.

The cost in xp of the next heritage point is 20+2*n with n equal to the total of hp owned.

hp_cost_in_xp = 20 + 2 * current_hp

xp_awarded = pop - hp_cost_in_xp_awarded_in_current_run - 50

  calculateHeritagePoints( removeXP = false ) {
    let peoplePoints = this.resourcesService.getTotalPeople();
    let xp = this.xp;
    let threshold = 20 + (this.heritagePoints * 2);
    let pointsToAward = 0;
    while ( peoplePoints >= threshold ) {
      pointsToAward += 1;
      peoplePoints -= threshold;
      threshold += 2;
    }
    while ( peoplePoints + xp >= threshold ) {
      pointsToAward += 1;
      peoplePoints -= threshold;
      if ( peoplePoints < 0 ) {
        xp += peoplePoints;
      }
      threshold += 2;
    }
    if ( removeXP ) {
      this.xp = xp;
    }
    peoplePoints -= 50;
    if ( peoplePoints < 0 ) {
      peoplePoints = 0;
    }
    return { hp: pointsToAward, xp: peoplePoints };
  }

  peopleToNextHeritagePoint(): number {
    let peoplePoints = this.resourcesService.getTotalPeople() + this.xp;
    let threshold = 20 + (this.heritagePoints * 2);
    while ( peoplePoints >= threshold ) {
      peoplePoints -= threshold;
      threshold += 2;
    }
    return threshold - peoplePoints;
  }

The formula for the population requirement where n is the number of HP earned: 100*2^(n-1)-50