"Brother A or B will have the honor to meet Davkul."
"A reminder for us all."
The brother who is the sacrifice dies, every Cultist邪教徒 gets a good mood, every non-Cultist邪教徒 will get a bad mood (They lose 4 mood levels), then there is a 50% chance for each Cultist邪教徒 to gain the tier 1 candle perk or get their candle perk's tier increased by 1 if they already had one, there are 5 tiers to climb
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Your campaign is at least 6 days old
Have at least 4 brothers
Score = 50 + Number of days that have passed since the last sacrifice took place
The sacrifice-selection will be 2 random brothers
The 2 brothers will be chosen from your 4 brothers with the least
If you keep your brothers at euphoric mood or eager mood they will not drop down to angry mood from the sacrifice
You can use the 21 days of cooldown after the sacrifice to safely explore far away from taverns
If you expect a sacrifice soon, you can hire some low level cheap brothers to ensure that your more valuable brothers don't get randomly selected for this event