Thx I did upload the screenshot

You should check Mission as well, both Mission & Challenge have similar quests, I often do both when I build new alt. 

Indent14 said:

You should check Mission as well, both Mission & Challenge have similar quests, I often do both when I build new alt. 

You have to farm 3* or higher stars artifacts, mostly from Hard & Brutal campaigns, and equip to a champion. I remember there are mission quests to farm 3 stars ATK artifacts as well. 

Thanks

So Which mean Is ATK campaigns with ATK artifacts something like that?

Equip champions with 3 3* or higher artifact sets.

It means 6 artifacts, 3 pairs of artifacts from the same set.

For example, you may equip 2 Life artifacts, 2 Offense artifacts and 2 Speed artifacts.

Repeated sets are fine, for example you may equip 6 Life artifacts.

4-piece sets don't work. You can't equip 2 Lifesteal or 4 Lifesteal artifacts, that wouldn't help.

Alex said:

Thx I did upload the screenshot

I am sorry, it did not load on when I post my reply.

For 6.6 and 6.7 you have to equip 3 SETS. There are many sets, but since you have to equip 3 sets, you have to use the sets that are 2 artifacts sets, like Attack Set, Defense Set, HP set, Speed Set, Resistance Set, or any set that requires 2 artifacts.

You have to use artifacts that are 3* or higher,

You can mix the sets, but you have to use one pair of artifacts for each set

For 6.6 you have to do this to 2 different champions, and for 6.7 do this for 3 champions

For 6.8, you have to do this to 4 champions, BUT there's an extra step, for 6.8 all of the artifacts used must be upgraded to lvl +8

Here is an example of what you need to do.

My Soul Drinker is wearing all Offense gear.

2 Offense pieces = 1 set

4 Offense pieces = 2 sets

6 Offense pieces = 3 sets

All the gear is 5 or 6 star.

Basically, This is all you have to do.

You just need to do it to 2 different champions.

Here is my second hero example:

My Apothecary is wearing all Divine Speed gear.

2 Divine Speed pieces = 1 set 

4 Divine Speed pieces = 2 sets 

6 Divine Speed pieces = 3 sets

All the gear is 5 or 6 star

If you don't own any Divine Speed gear, Its ok!

You can use regular Speed gear.

The mission doesn't say what the gear needs to be.

All it says is to have 3 different set bonuses with gear 3 star or higher!

In this example, You can see how I was able to finish the mission.