PvP option can be bypassed by plugins
When the PvP option is set to false, it can be bypassed by plugins - for example, with EcoEnchants. If I have a sword/bow with an enchantment that gives levitation to the victim and attack a player, the damage is canceled, but the enchantment still activates.
I do realize that this is something that should be done by the EcoEnchants developer, but unfortunately, many developers ignore issue reports. It would be great if there was a way for MythicDungeons to cancel the event prior to any plugins.