so I use a combination of cabalist and defiler for solo play when I'm out farming for aoe damage and survivability. I like to summon the beacon and load it up with buffs like foul growth and hideous reconstruction and then unsummon the beacon so the next time it's summoned it still has those buffs ticking away without having to cast them as I enter combat. That doesn't work with the level 65 mastery divine favor/providence. The buff doesn't stick when it is re-summoned.