I like the idea but I think it's better to explain how it works.
I believe that the ability is better in the following way: by activating the ability, select a given area 5x5 sumnon a red smoke that will heal every second to the allies in it (they no longer eliminate the following positives of the enemies, either will delete the negative efects in alies )
CD = 30 seconds
1/4 duration 4 seconds, will heal 15% of the necromancer's magic damage
2/4 duration 6 seconds, will heal 30% of the necromancer's magic damage
3/4 duration 8 seconds, heals 45% of the necromancer's magic damage
4/4 duration 10 seconds, will heal 60% of the necromancer's magic damage
In this way a necromancer with 600dmg of magic damage at 4/4 would heal 360hp per poop hit, it is little but it can cure critically so it would work well
I think that curators need passive skills or constant mana use skills but I really like this xD