Summoning: +5% yield
Used to allow for some item generation since guilds postresearch before skills were introduced were worthless outside of random item generation so top rankers generally didn't keep any. No idea now since I'm not going to create a mage on another server to verify (5/30/2011).
Luck from a God may have an additional effect now since I noticed this for the first time this reset (5/30/2011) in my battle reports... "Good fortune shines upon Malbec (#31)'s armies."
5% extra summoning
5% extra concentration (for casting off/opposite colors/dispelling)
2% item generation
- Chest/Map/Bottle: Increases chance of item generation
You can also get Bad Luck from gods' disfavor. Example of message in the donation screen after donating :
You hear roar in anger. You are now disfavoured by Moon, the Light in the Night.
In the Status screen you can also see this message for 24 hours :
Effects : Summoning: -5% yield