Q:
Projectile finisher of minions
A:
The minion in question gains health. The minions are given credit for the source of the projectile finisher, so it would be the same as if another player did it. Also worth mentioning that bone fiend has two finishers per auto attack, so double the effect.
The only special interaction is that minions use your condition damage/duration. So if they projectile finish through a poison field, while they are given “credit” for poisoning, it is your condition damage and duration that they use.
Although ive never tried it myself, im assuming its the Minion, because with other summoned allies with combo finishers, ive observed the effect being applied to themself. (Such as Phantasms on Mesmer doing Leaps to get Auras.)
didn’t test but logic says there’s no reason it wouldn’t be the minion.
Bone Fiend and Flesh Wurm are your two minions with projectiles but if you are running a MM build, Chillblains on staff is your only regular field (poison) unless you can get a field from an ally.
If, instead, you run a wells build (lord knows why, anymore, outside of WvW zerg bombing,) then staff’s auto-attack will life-steal for you.
Mixing wells for the fields and minions for the projectiles is not very productive but you can give it a shot.
If you’re playing MM you have pretty common poison fields from Death Nova. Every 20s or so you’ll put out double poison fields from Bone Minions, besides that you’ll get one anytime you or your minions die.