Hello, after messing around a few days I notice that threaten doesn't seem to be working properly. While the debuff gets applied to bosses and monsters like normal it does not seem to be adding the -20% properly, my damage is still about the same and so were the guildmates I was bossing with. If this can be looked into at some point I'd very much appreciate it, thank you very much. I'll continue to do more research.
Keep in mind in our version of Maple, monster defense doesn't do a whole lot. 20% less defense means like ~100 damage more per line on Zakum.