This floor is mad tough — I need advice on what teams I should be setting up and how to combat the ruin guards. The problem isn't the cryo/pyro hilichurls, it's the beefy ruin guards. They seem to have astronomical health values, far too disproportionate compared to their overworld counterparts. I can clear 8-1 and 8-3 with 3* each with no problem, but 8-2 is really starting to wear me out mentally.
I've tried using bow users to hit the weak spot, but even when they are stunned they take virtually no damage. Both of my abyss teams are setup so that they can apply Superconduct when necessary. My carries on both teams are both level 70 with high talent levels and level 70 weapons, with a full set of +16 artifact gear. I must be missing some secret trigger that should work.
Best Answer
As Ruin Guards have 70% base physical resistance, Superconduct only reduces that to 30%, which is still a pretty high value given that most other mobs only have 30% or 10% physical resistance.
In addition, Ruin Guards' elemental resistances are only 10%, so you want to focus on that.
Thus, you still do not want to be hitting them with physical attacks. Focus on elemental ones, with characters that hit with elemental attacks as a default. Most of the non-Anemo 5 stars are able to do this, eg. Diluc, Klee, Keqing, Mona. Also you can use Xiangling's or Fischl's E to help with additional damage.
Just put one DPS and one Support DPS on each team, along with a Support/Healer with Thrilling Tales of Dragon Slayer (+48% damage for 10s every 20s on character switch) and you should get 3 stars easily - I did this with half of my characters having unlevelled artifacts.
Also it should be said that you should group the Hilichurls together with the Ruin Guard as much as possible, so you don't have to run around trying to defeat them after bringing down the Ruin Guard.