Trying to decide on best skill order as I level in the new ladder. Seems like you want to get to 10 mastery first, then max tainteds, then blood boil, then tossup on blood oath vs engorge before maxing mastery
I'd say you want mastery with goatmen 1-11 and 12+ you're pumping tainted and a few extra points from quests to finish 10 mastery. Not sure at what points blood boil synergy is more damage than another hard point in tainted but after norm it won't matter. 10 mastery - 20 tainted - 20 blood boil, then return to max mastery, then engorge. Blood oath won't be more than one point until levels 78-97 or so. You need that max engorge to kill immunes in hell.
On a fresh ladder you can use leaf, authority, magefist, rising sun, measured wrath and a tele staff and you're already at 9000+ tainted before charms, torch, anni, cta, enigma, etc.
Why bind demon?
Explain?
The damage is too lopsided towards fire with low % piercing on summon tainted. A bound demon can provide amp damage, which is often tripling the physical portion of blood boil, your main tool to kill immunes. About 2x overall depending on target and setup. Hence by using 2x tainted and 1x bound demon you get both the instant kills on non immunes from tainted as well as fast clearing of immunes.
In an early ladder with just 1 point bind you can simply take a siren from frozen river and it will spam amp on its own. Once you're more confident about not dying a lot and have level 20 bind after +skills and swap gear (ex +4 on bloodpact shard, +3 circlet/ammy) then you can upgrade to the TZ cursed holy freeze demon. And the first recommendation was venom lord but I do think a flayer shaman could be an interesting alternative