The High Explosives Punch Card is one of the 52 Punch Cards available in Fortnite Chapter 2 Season 3 after three additional ones were added in update 12.30. Punch Cards are in-game challenges with specific goals to reach to earn XP. Each punch you complete on any card is worth 14,000 XP, which is a refreshing change from the weekly challenge system.
Punch Cards won't change or reset for the duration of the season. Instead of being completed and replaced regularly, the new goals are meant to be reached over the course of the season. Other Punch Cards include the Treasure Hunter and the Munitions Scavenger Punch Cards.
High Explosives Punch Card Fortnite: How to Complete
High Explosives punches are earned by getting certain numbers of enemy eliminations with explosives. Completing each punch contributes to the next so progress stacks continuously.
Completing all six punches will earn you a total of 84,000 XP, but you don't need to finish all 6 because you'll earn 14,000 XP for each.