tainted with fire sunder and infinity makes a fire immune monster like 78%res, all you can do is get your demon hitting them and throwing down blood boils. I'm not going to lie to you, fire immunes slows you down considerably. Very fast against non fire immunes though, hence why all the videos are of the ice caves in act5.
alternatively, you can use your beefy demon and 2 defilers to take down fire immunes, but then you'd have to resummon your tainteds...and that's annoying with all the prebuff.
That's basically it!
It's a great build, and still good against fire immunes. I personally prefer the demon defiler build.
well act 5 is just highest xp straight line you can claim in most pubs without having to worry about hosts fighting over tombs. I took tombs whenever I hosted, and only immunes are burning dead that die instantly to blood boil
chaos is probably the single worst area for fire immunes in the game and you could just solo a P8 TZ96 chaos with a taintlock anyway. Its slower than areas where you kill everything teleporting around, but its still faster than most chars
and its one of those things where you
could summon 2x defilers instead, mooting your prebuff tainted- and deal 56% more blood boil dps. And then resummon tainted for diablo
but its not like its so slow as matter. I did it all the time in TZ96 p8 games, its a single zone in a 30+ minute game.
Tombs are better XP, act 5 areas are better XP. Worldstone is better, flayer is better.
Chaos is good when you are both 1) on a char who doesn't care about fire immunes and 2) in nonstop new-game runs, instead of full split 30 minute games.
Chaos is pretty irrelevant when you only run it once in a 30+ min game, and there's no real reason to seek out fire immune heavy areas like it when you could just do other areas
faster. Especially since in act 5 you can go all the way from shenk to baal