Ok, the base composition is (in the order they take turns):
1) Coldheart
2) AoE hp burner
3) Teodor
4) Renegade (skill reset)
5) AoE Stun / Freeze
You need CH to go first, to make sure enough spiderlings spawn before applying the burn. The speed of Teodor needs to be around 200 or something (don't know what the exact breakpoint is, you can probably go lower, but you would never want your champs that slow in other content). That ensures he gets to take a 2nd turn before the spider goes. So for example: CH 202+, burner 201, Teo 200. Since I do dragon 10h, my Teo is at 253 speed, so I need to make the other champs correspondingly faster, which is a pain. Haven't actually rebuilt my CH for this yet.
The gear on renegade doesn't matter at all, as long as she's fast enough to take a turn before dying. You can use whatever stun champ you have, it just makes the run faster, as you don't have to watch the spiderling attack animation over and over.
Artak can be used either in slot 2,3 or 4, so he'll pretty much fill in for whichever champ you're lacking. Slot 4 can also be replaced by a 2nd Teo of course.
Accuracy needs to be about 250. Other than speed and accuracy, the stats literally don't matter, so you can build your champs to also be useful in other content.