Boss-as-damage-source

[PrimalPower]

Is your feature request related to a problem? Please describe.
When I use the damage victim effect for eco-bosses it doesn't trigger being hit by a mob so the damage isn't reduced by toughness and doesn't grand defence xp (for aurelium skills at least)

Describe the solution you'd like
There to be an args for damage_victim called boss-as-source which will use the boss as the damage source (defalts to false)