Have a necro healer that I played with for over a year with no real group utility. Want sets that increase group damage output. Prefer unnamed buffs like spc, since everybody comes with major brutality, sorcery etc. and that would be wasted.
Sets I have in mind:- Olorime, powerful assault, elemental catalyst, master architect (this one I don't have and hate hof, so would like to avoid).
What combination is best and what light/medium sets have I overlooked?

Checked out roaring opportunist but don't know how get it to work like everybody does. At 28k max mag and just 2200 spell damage, it won't stay up for longer than 7s without jorvuld's and maybe 10s with.