A simple place to start is make sure whoever your tank is has enough resist to not get poisoned, you need 225+ for stage 20.

You also want to make sure Armiger has 100% crit rate, then just have him use his a1 on big spider

Curious

Usually redditbots only have 1 post, but here the quantity is 2

well, they're trying something new, i'll give 'em that.

Thank you for the idea, managed to get past 15 yesterday. I made Grizzled Jarl my tank with a total of  255 resist, the run wasn't flawless but gets the job done. Now I'm building Sepulcher Sentinel as a Force tank for 16. Planning to just remove the artifacts from Grizzled Jarl and transfer them to Sentinel. Will do the same idea until I get to Spiders 20. Just one question though, for Void affinity spider, which does spiderlings target?

I'd recommend rhazin as your force tank. He's already very tough, he brings weaken and def down for big spider, and wipes tm.

As for who gets targeted on void, good question. I'm not sure

Is it worth getting rhazin to 6*? I know he's a good fire knight champ as well, I just though to make sepulcher my tank since she's (i think?) probably used in different areas of the game as well, CB for example. 

Personally, I love Rhazin, though sometimes it seems like I'm the only one

I use him as the DPS on my 1-key UNM demon lord team