Where can I find the Explosive Scroll Kunai?Central element of the challenge, the Explosive Scroll Kunai was introduced through the collaboration with Naruto can be obtained in two ways. The first is to search chests or loot llamas and hope it's there. If you don't want to bet on the luck factor and save time, then go directly to Kakashi, who allows you to buy one, in exchange for 150 gold bars, which is quite an affordable price.
Then, you will only have to hit enemy players with this weapon to validate the challenge. You can focus on named places or the center of the map to find players more easily. Note, however, that you have to be precise, since if you don't hit your opponent the first time, the task will be complicated.