Ok, I thought I was picky…
Usually if someone talks about explosives, its them bombs. Meaning jars. Oh and make sure to hit e on them instead of firing an arrow at them. I am not certain wether damaging the jar counts as using it.
I totally agree it should be renamed because it has to be an Explosive Jar and it HAS to be manually triggered. You can’t shoot an arrow at it. I used Demon Fire, I used a Explosive Trap (thinking two for) and then I made a Explosive Jar and shot it with an arrow. None of that triggered the Journey Step.
You must use a jar from your inventory and manually go up press E to light the fuse and run away. No other method will trigger that step as complete.
I guess “use an explosive” could be interpreted different ways. Maybe their meaning was as a clue and we are meant to try all kinds of different ways to use one and experiment with all the different types of explosives. I guess so many other steps are so specific. Fire a trebuchet. Go to X place. But then they have vague ones like “eat a lasting meal” and a ton of choices complete the step. That is what makes this one seem like a bug, because it is so specific for what can complete it.