Jack of Trades costs 15k Loyalty Points at the Xuan's shop.
This aura will grant you free XPs, if you manage to get at least 1 experiance point in 10 different skills within 3 hours.
The free XPs comes in by XPs book, which will be given to you by Xuan himself.
Remember: You can't collect your reward, if Jack of Trades aura is still active (therefore you have to wait 3 hours, or simply unequip it, so it will deplete).
The formula for XPs reward is: x^2 - 2x + 100. Where x is the level of the skill on which you use the reward.
The actual Guide:
This is fast, easy and effective method, to gain XPs in 10 skills withing 2 minutes of work.
40 Thieving or 1 Prayer
- a hatchet (toolbelt hatchet works fine)
- a tinderbox (toolbelt tinderbox works fine)
- a melee weapon (fists work OK, I guess)
- a ranged weapon (any)
- a magic staff (or runes)
The method is this: Teleport to Varrock and head to the Varrock castle. Activate your JoT aura: Chop down 2 logs (any tree works), make a fire from 1 log and fletch another (anything works); head north and kill a guard (XPs MUST be on shared between Attack, Strength and Defence!), equip a bow and kill another guard, equip a magic staff (or bring ruens) and kill the last guard. Pickpocket one guard for Thieving XPs, or if you don't have 40 Thieving, simply bury a bone.
We got our XPs in 10 different skills: Attack, Strength, Defence, HitPoints, Ranged, Magic, WoodCutting, FireMaking, Fletching and Thieving (or Prayer).