- Hmm well, Mage + 2x Caster ring [which should be Trangs + 2x Caster ring, really] are alright but when you're going for extra DR [I'm guessing you're talking about Mage + rings + Verdungo] that usually means your opponent is physical damage, and most of the time you're talking about physical damage you're going after things with high defense [the exceptions are Wind Druids and Bowzons], and you generally need good AR [Angelics or Hsarus Boots+belt] to hit them. To this end, I don't think it's worth sacrificing some stash space for a Verdungos, unless you're a bit nervous about not having max DR. It's a good combination, but due to stash space, I wouldn't suggest having it. Having 38% DR is usually enough [CoA + Enigma].
- Yes, you need to stack a little light resist. Otherwise those farcast prog using Zons will kill you really easily [you need to have stacked resist if you use Tgods, or Tgods won't do anything]. The same goes for light sorcs. FoH is similar to blizz sorcs, which I'll discuss now.
- Blizz [and cold sorcs in general] require you to stack specifically against them. This is because if you only stack a few items [trangs and FCR rings with 15 cold res on each ring, for example], you'll STILL be in the -100 CR, even including your normal resist stuff [Arreats/Torch/Anni/etc]. You have to either stack a lot and sacrifice something [charms/helm/weapon/etc] or just do what I do and wear 2x Ravens. The absorb doesn't work with the first hit [because absorb heals first, but since you're at full life, you don't get the life you 'heal'], but in general you can tank 3-4 blizzards with 2x Ravens.
- FoH is similar. It's annoying as hell with FoH, since with Cold sorcs you can dodge orbs/blizzards, but FoH is auto-hitting, so you HAVE to stack, or you'll get killed easily. I'd say get a Kiras with an Ort [or an Um, so you can just use that same Kiras against Cold sorcs] and a few life/light res SCs. If you're West NL, then you have access to Rune Loops/Eagle Whorls, which give 62 and 54~ light res, respectively. The majority of FoHers don't have high defense [or even a Smite backup], so you can generally get away with constantly tele WWing them. V/T's or T/V's require a different setup, but then again that's a different topic.
- Note, I originally planned to get like 10x 11light/life resist SCs and some other gear [which is mainly geared for V/T's and T/V's], but since V/T's and the like are rare on West NL, I got lazy. If you fight a Smite/FoHer, you need DR, resists, AND AR [since they usually have good def], so that means you need to rely on SCs for resist. You can use a weapon to give you resist, but then you lose damage. You can also just play without a CoA and use Kiras for resist, but it's up to you. Bottom line: Make sure you have enough light resist with both hell mode and conviction taken into account. Then you can just treat him like a smiter.