After thinking about it for a little, I think it should be a full protection 5 set with a sharpness 6 fire aspect 3 sword and a bow with infinity 1, power 6, punch 3, and all pieces have unbreaking 4.
Suggestions: Lightning-Strike-For swords that have Lightning strikes on them they are buy able from the buy craft store.But the use of them is it does 2 hearts when lightning strikes at them so if your lucky and someone is low that will kill them.
$1 fo 3 gapples, /kit OGSet which is P5 Set and S6 sword, /kit Churro for a eatable churro that fills your hunger If you don't know what a churro is, google it, and /sp baller for all PvP potion affects at one time that last a minute each...
If a normal creeper gets struck by lightning, possibly through a sword, it will become super charged. This could be a possible problem in the Freeworld.
To create an entirely new item without a mod is hard. You would have to have a server texture pack with a re-textured item that can be re-named to Churro.