You have a paragon, you have a Tayrel...those two can make it....

Quite a few videos out there you can watch on that exact pairing: 

https://youtu.be/8JzAcAkaOGo

https://youtu.be/4imF59UEPJ0

Among others. I used Urogrim (fully booked, pre nerf) with Paragon, though not sure how well that would work now. 

that paragon don't make himself unkillable always..so he dies..i watched the videos..and did everything..but keep going fail.. 

You have to run it in manual.

Precisely what Angwil said. It 100% will require you to manual. Otherwise, GG. Paragon AI isn't the friendliest.

I'm a new player. 

I did not know what your post was even about when I clicked on it. I am looking at all the Champions you have. "How can you really not get victory?" I do not even know the ranks and levels of the opposition for Stage 12-7 Nightmare Difficulty.  I have not made it to Nightmare Difficulty only Brutal. 

I thought you could upgrade artifacts to +16 on the Champions that have been facing defeat. I did not take into account that you may be a player that does not buy Limited-Time Packs. FreeToPlay (FTP) Player and that might be slightly difficult for you to do. You must have been playing over a large amount of time to have accumulated everything you have. Awesome!

How come you did not mention that you wanted help with Victory on Stage 12-7 with the Auto setting turned on? How come you are not showing us more screenshots of each Champions Artifacts and your current Storage of Artifacts? Otherwise the community is only going to be able to give broad advice not, information more mathematically accurate.

i' ve been playing the game actively since may 2022. now it's september and i am at 12-7 nightmare and it's somehow odd to pass it. 

it matters not if auto setting is turned on or off.

showing each champion ?? that's too much effort.. what about you tell me the champs and i show them ? and then i show my artifacts too.

as a new player did you finish 12-7 nightmare ?

thanks

As everyone has said, you need to manual it and keep unkillable up as much as possible. It's going to be rng and you just need to run it until it works. It took me 17 runs back to back with Miscreated monster and and tyrant ixlimor. I didn't have an unkillable so I had to use double ally protect and inc def to survive the peril and all buffs had to be up when the hit came. 

Increase DEF is useless against Peril. If you want to tank it, high HP and Ally Protect will do the trick. Or unkillable. 

Touche. It was probably the hp aura and ally protect that finally made it work for me. Regardless, my point still stands. 

In the boss scene, the enemy kills my paragon before I can grant unkillable to him. this is very annoying..  :(

How fast is your Paragon? Is he booked? You'll need that A2 on a 2 turn cooldown. 

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A2 is full..and can you check my stats ?

I ran mine around 205-210 speed to make sure they went twice versus waves, made life easy. That said...you do need to time having A2 up for beginning of the boss fight.

what was your other champ with paragon ?

thorne , 

i did it paragon and valkyrie but got 2 stars ? why ?

ok. nevermind..time out..

yep, needs to be done under 10 minutes. 

and i used uugo pre nerf, tayrel after to test it out. both worked. 

I've tried with Scyl and Paragon but can't get it done under 10 mins - what should I do? Still kind of a n00b when it comes to figuring out stats -- 

**I've also tried with MM/Paragon and still takes more than 10 mins 

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Both need to be well over 200 speed, run the boss encounter on manual and under 10 minutes. Really takes a good amount of concentration but doable.

Thankfully, you only need to succed once.

- Coag