Lost Souls set does that, gives you +1 of them. I have a Cabalist focused on that + Skeletons. You need some other voodoo to change the Hellhound damage to Vitality but from there on, they become pretty potent.
But I agree we should have other sets that maybe focus more on their fire/chaos damage. I experimented with using Veilpiercer or Dracarris with them, but the latter works mostly for hybrid summoner builds. I have plans to try to make a hybrid Chaos damage focused caster/summoner with the Unholy Covenant set (the mythical version) but I am far from trying it out, only at level 55.
I hate Gargabol, with all my heart… I have so far had every build from summoner to caster and ranged and melee and it was a major pain to fight with all of them in its natural environment. You have this gigantic mound of rock walk after you (it is faster than it looks) while the fire jets can randomly erupt from anywhere and kill you instantly even with max fire resistence unless you move, and then if you try and stop to attack, the spawned lava plants will bombard you with even more fire! I never met Gargabol in the Shattered Realm, maybe without the fire jets he is not so bad, but those plants are a major detriment to every class that needs to stop in order to fire/cast spells…
I can concur to this. Iron Maiden is somehow worse because she also stuns you and lets slower melee bosses close in and finish the job while you cannot do anything.
Heck, I noticed even just during regular play that there are certain monsters that seem to ignore your pets more than others, and rush you at the slightest provocation (meaning for me, Curse of Frailty or vines). Yetis and their Ugdenbog Leafmane cousins, and the more dangerous ones, Cronley’s Murderers. They always come and hurl that damn spectral dagger right at me, ignoring the pets, and I bet that thing does % life reduction because even with max vitality resist it does hurt.