Cult of Pleasure is an unusual location in Total War: WARHAMMER III. It massively increases unit and character experience gains in the region and spreads Slaanesh corruption and cults.
Cult of Pleasure
The most ardent of these devotees descend a starless path where the lines between a paraded victim and their sybarite audience blur.
Unit experience gain per turn: +100
(all own and foreign armies in region)
Character experience per turn: +200
(all characters in region)
When Slaanesh corruption is 100 or more:
Immune to diplomatic penalties from trespassing
(all region owner armies)
Slaanesh corruption in adjacent provinces: +10
Slaanesh corruption: +30
(local region)
Each turn there is a 10% chance to spawn a Slaanesh Cult in one of your regions (excluding this region)
When normally killed in action, your Lords will be wounded instead
(all region-owning Lords)
When Slaanesh corruption less than 100:
Slaanesh corruption: +10
(local region)
Each turn there is a 2% chance to spawn a Slaanesh Cult in one of your regions (excluding this region)
Unit experience gain per turn: +100
(all own and foreign armies in region)
Slaanesh corruption is 100 or more:
Immune to diplomatic penalties from trespassing
(all region owner armies)
Slaanesh corruption in adjacent provinces: +10
Each turn there is a 10% chance to spawn a Slaanesh Cult in one of your regions (excluding this region)
When normally killed in action, your 
Lords will be wounded instead
(all region-owning Lords)