Retribution is very useful when you are Jungling/Farming. but not in Lancelot's case once you hit the first minions wave you'll add the second abilty then go hit the jungle all by yourself, and The Retribution battleground spell can be upgraded through purchasing different Jungle Items.At early game add the second ability first , so you can farm minions as fast as you can, and its very useful in dealing extra more damage at any enemy that tries to dive with his teamates at first remember to max the 2nd ability to reduce its cooldown and mana consume , then add the first ability followed by the Third ability at Lv4.