The quest reward can only be obtained after being out-of-combat for 5 seconds.
If the last coin to drop was a gold coin, the next coin will be a mana coin. If the last coin was a mana coin, the next coin will be a gold coin.
The coin drop rate starts at 0% and increases by 11.11% for every minion that dies (regardless of whether it drops a coin or not). When a minion drops a coin (including siege minions) the chance drops by 33.33%. This value can go below 0%.
Because of the way this is done, for every minion wave (with or without siege minion), the average coin drop rate is 2 coins per minion wave.
From this, we can determinate the average passive gold value of Favor: 9.33 per 10 seconds.
Because the Favor passive does not benefit the player who gets the last hit, Ancient Coin is best purchased on supports who plan on spending a lot of time in-lane.
Quest gold value reduced to 500 from 750. Still requires to upgrade to Nomad's Medallion.
Removed Quest Reward:Favor is upgraded to Emperor's Favor making champion takedowns grant both the gold and mana. You also grant 8% bonus movement speed to nearby allied champions moving toward you (1250 range).
New Effect: Quest reward now grants the active Warding with 3 wards in stock.
Unique Active - Warding: Consumes a charge to place a Stealth Ward at the target location (600 range), which reveals the surrounding area for 150 seconds. Holds up to 3 charges which refill upon visiting the shop.