Fairy is an automated system that reads and measures the amount of takeovers that's been happening on each particular zone.
Each zone is provided with takeover points and points per hour(PPH). What Fairy does is to change those to points depending on action happening on that zone. The more takeovers during the ongoing round the less takeover points and higher PPH it get for the next round.
Fairy is normally activated every month just before the new round. The name "Fairy" is a clue to the purpose of the process, which is to make the game fairer. But subjective and objective justice is an ongoing discussion in a game like Turf :-)
Every time Fairy runs it can either change the zone two stages upwards in PPH or down one in PPH.
For instance, if a zone currently have 140/+4 (Takeover Point/+PPH) it can either change upwards two stages 125/+5 or 110/+6 depending on previous rounds takeovers.
However, if the takeovers was very low it can instead change down one stage into 155/+3. It is possible for a zone to be unchanged, not every zone changes.
Zones created during the previous round or a few days before the start of the previous round cannot change value as the activity in a new zone is not considered representative of how it will be later. The zone then continues to retain its original set value until the next round, when it can change value as normal again.
Another system called Tinkerbell is also implemented into the system.