Luck

Effects

Know Effects

Summoning: +5% yield
Increased Exploration

Speculated Effects

• Chest/Map/Bottle: Increases chance of item generation
  

Bad Luck

You can also get Bad Luck from gods' disfavor. Example of message in the donation screen after donating :

You sense a heavenly conflict between Mr. Satan, the Ruler of Nine Hells and Moon, the Light in the Night.

You hear roar in anger. You are now disfavoured by Moon, the Light in the Night.

Moon, the Light in the Night cursed you! The Star of luck begins to avoid you.

In the Status screen you can also see this message for 24 hours :

Your realm hides in fear knowing you have scorned Lady Luck. You feel that you will regret playing today.

Effects : Summoning: -5% yield

Notes

Star of Luck from different sources stack.

Sources:
Vote (use the link "Vote for our game" on the top of your main screen)
Wish
God Favor