The event is available starting from level 7 and 8.42.01 version.

Event walkthrough:

Send planes to event destinations to:

▶ assemble the "Ghost Artifacts" collection and get the Ghost Crew bonus.

1. Use the Ghost Crew bonus to land Ghost Guest Planes in your airport.

2. Land Ghost guest planes to assemble collections "Embodiments of Fear" and "Witch Costume"

3. Assemble collection "Embodiments of Fear" to get the "Dark ritual" bonus.

4. Use the the "Dark ritual" bonus to summon Black Wraths.

5. Banish Black Wraith using the Black Wraith Traps. Assemble "Collection of the Seal".

❗ Necropolis Banknotes also drop from the Black Wraiths. ❗

▶ get an "Anti-phantom Vacuum Cleaner" to banish "White phantoms"

1. Banish "White phantoms" to get Black Wraith Traps, Shotguns, Flares.

2. Use Black Wraith Traps to banish Black Wraiths.

Necropolis Tower

In this event we are introducing a special building -> Necropolis Tower. The Necropolis Tower will increase the profits of all Halloween buildings within a 4-tile radius. Upgrade the tower to level 6, and the profit bonus will reach 15%. 

Banish Black Wraiths for a chance to earn Necropolis Banknotes

⚠ 1 Necropolis Banknote = 99 usual banknotes ⚠

x 1 =  x 99