A team for those that want a 100% success rate team without leaving top of the line stuff in there.

**Points to consider:**  
Rem can be replaced by sez (atk buff ee) in the back, whoever is in the back just needs to be 130+spd to avoid having the wyvern taking 2 turns before they go, other than that they can be built for pure dmg with no regard for spd, rage set is not needed.  
Rem and shwa have high atk because of shwa's necklace, by no means do you need such high atk values, if anything it made the dual atk tunning more difficult.  
Summer Hwa has to be faster than the mobs, slower than the wyvern (186-230), most pvp builds in those ranges should work with minor adjustments to the team due to the artifact (+20%atk makes things tricky), this is pretty much all the spd tunning needed  
For the first wave shwa easily does enough dmg to get them killed by rem's s3 or sez's encroach; the only condition on this is that rem has to kill the 3 mobs together, sez doesn't have that condition.  
clilias, at least 10spd slower than shwa and she needs to be unawakened to prevent her from taking the extra turn, I'm not even sure if it would still work if she takes two turns due to the cr push on the wyvern.  
ken, at least 10spd slower than clilias and 10 faster than rem/sez, 200er, 5\* awakening to equip his dual atk ee, he just has to survive one turn  
If ken does the dual atk with rem the dmg is so over the top you might even end up with a whole leftover extra atk, if not, either shwa or sez are perfectly capable of dealing enough dmg for sez to s3 the remaining hp.

**Improvements:**  
My shwa has an incredibly inefficient build, atk% necklace is the worst offensive stat and there are plenty of wasted subs.  
A shwa using ddj just trivializes the whole thing, it easily adds 20k+dmg on the wyvern.  
Clilias has atk% team imprint  
Team artifacts, warhorn will add more atk%, if I had an extra shwa I would be able to pretty much ignore her critc thanks to midnight bloom

Low gear requirement 100% wyvern team (my bad with the other post)