Artak

Id go with Artak.  Being HP based he is much easier to keep alive, has every ability on an AOE and also provides a bit of survivability with his decrease attack.

I would say "it depends". Without any other context, I'd argue that Sicia is the better choice, because she brings an AOE DEF Down and Weaken, which is a really valuable contribution if you don't already have those.

Artak. HP champs are pretty darn good. Built in survivability in their kit really shores up team building and gearing.

Something else to consider - the answer may very well be "both", especially for Spider. If Sicia is faster than Artak, you go Sicia A3 -> A2 into Artak A2. Assuming someone goes before them, that'll mean 11 HPBurns placed by Sicia and then detonated, another 11 from Artak, and then another 11 from them when they get their turns. Each is 3%, for a total of 99%. Couple that with the face damage from the two of them, and you should clear everything.

To be extra safe, if you run, say, Arbiter, Sicia, Artak, and then any two max-hp champs (even Armiger will work), you should be able to get a full clear in like, 15 seconds.

Would this work with crohnam and artak ? (both aoe hp burn , extender and hp burn activator)

If so which one should go first ? What kind of preset would i need for them to not use the same skill on the same turn or is AI smart enough to use the activator on its own ?

Artak is a solo god. so i'd go for him first. Especially since your account looks newish.

artak is good but i find him inconsistent without books.

Not for Spider, no. The key is that both Sicia and Artak activate *all* HP Burn debuffs. Crohnam unfortunately only activates three of them.

Maybe it could work alongside Djamarsa, though. Since the passive triggers every five active skill uses, maybe the setup could be Crohnam A3 -> A2 into Artak A2 into Djam A2 targeting Crohnam for another activation of the A2, and then another active skill from anyone else activating Crohnam's A2 again. 

interesting question, forgot to respond your thread:

I don't think you'd want to run them together due to when we're maximizing Artak, he's taking a loooooooot of turns. This means we're going to proc Crohnam's passive a lot and I think we're going to run through the HP burns. If I tried it, I think I'd want to go with Crohnam placing the HP burn first. 

I think if I had both, I'd probably try something like Arb + Djam + Crohnam + Artak + Coldheart. I could see that working.

True about almost every champ in the game, really. Sicia is going to be the same, both need to land burn 100 percent.    

I'll be wait for Artak fix, then choose after that.

You are wrong about books if you have 2 HP burn champs. 75% is enough if you have 2. I clear spider lvl 25 in 23 seconds. The run is consistent, sometimes 27-28 secs. I have Crypt King Graal, no books, lvl 50, and Artak no books at all. Graal does burn,and if he doesn't burn all spiderlings, then Artak finishes the rest with his A3. Graal freezes everyone and Artak activates burns. I have Miscreated Monster for shields and 2 Coldhearts to control turn meter and do 750k each, so the boss never takes a turn

As for Artak or Sicia, I would go Sicia 100%. Champions with weaken and decrease defense on the same skill...LOL they are rare and op to clear any wave in any content, Venus, Dracomorph, Lydia, etc. 

What blessing for Sicia ? What do you recommend ? Phantom touch, brimstone or.maybe hero soul ?

I'd go Brimstone.