Cant find anything on them, i have missions available , but not sure what they are.
You get a Mana from attacking & winning from an opponent who has higher stats than you.
Mana it's a winner-buff.
As already Angelus007 wrote you can get it from race battles player vs. player in which you are a winner; no matter if you are attacker or victim. The opponent must have higher at least one skill then you.
After a race fight the winner gets a buff for 20 minutes which is basically a temporary skill-bonus. This Bonus depends of you and your opponent.
battle value: 1.166
battle value: 994
97 difference = -113
147 difference = -51
113 difference = 2
88 difference = -59
124 difference = 84
In this case the biggest difference between the winner and the loser ( skill points which includes also skills which you get from activated items ) in favor of the victim is skill "Charisma", so the winner gets a Charisma buff for 20 minutes. See the table. The bonus of the buff is calculated as follows:
25% of the Skill difference.
25% of 84 = 21
Result: The winner receives a 20 minutes buff of +21 on his Charisma skill.
Ah ok, thank you both