This bless was exclusively thought for Open PVP, to make it more of a fair environment for players that had recently left dawnport into mainland, this bless will protect you in every non-aggressive PvP environment (Dove mode/ white hand mode) so this means If the person hits you first and starts an aggression you are able to deffend yourself without losing your adventurers blessings, so yeah, self deffense mode is allowed. At any rate you will get a red warning message on your server log channel when you activate a PvP mode that will anulate the effects of this bless. Last but not least, remember you wil only be protected by it until level 21, after that you'll need regular blessings.