You said you watched the videos HQ linked to you? I have no idea what your deal is or if you even understand what people are saying to you on here.

Brutal 12.3 is brutal campaign level 12 stage 3. You use  one 60 champion and 3 green champions or what ever champions are food and level the food champions to use as "chickens" you do not get actual chickens.

Also to take a picture for the forum on your phone if it's android push power+volume down to take a screen shot then to upload it to a post just click the insert image button on the top left of the post box.

You complain about lysandra who is probably still level 50, probably has no masteries, probably is not booked, and as you said 235 speed. 235 speed is terrible. You will have trouble farming any better gear until you can farm dragon 20 preferably in under 3 minutes and definitely with a team that wins 100% of the time.

AND just stop spending money on this game. You are wasting money on stupid stuff and obviously have zero clue as to what you should be doing or buying.

I hope this helps you but I think you are just trolling at this point, do not speak or understand written English, or have a severe learning disability.

GL

This is my "campaign farmer".

Skull crown only aoe.
They solo clear brutal 12.3 in 7 seconds.
I use her with three food champions to level up the food champions.

I'm showing you this example to know similar stats to aim for.

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I posted a detailed explanation with not only one pic like this, but several pics, in a thread of Mr. Warthog, here. It doesn't help. 

Have you watched the videos I linked? I have linked them again below for your convienence. They clearly explain farming food as chickens. 

See, people on the forums and in the game use the word chicken for two different things. 1) The chickens you can buy in the offers from Plarium, something I have never personally done. 2)  Uncommon (Green) and Common (White) champs that you rank up to max level, ascend, to 2 stars, then 3 stars, then 4 stars, then 5, and use IN PLACE of a 5 star chicken.

Here's a video on the basics of farming, produced a long time ago by Raid:

https://youtu.be/Ho3yE7kSN6A

Here is a Hellhades video on farming that goes through basics. all the way through efficient dungeon food farming:

https://youtu.be/mzSCEGQJ3dI 

expected reposonse: 

"what link?.....Does the link have chicken?......I want chicken not link!!!"

Reading these posts really make me cringe at all the advice people here have given yet you've ignored them over and over again.  If you want to get better actually start doing what people are telling don't just be a fussy pants and moan about how the game is unfair.

What two champions do I need to beat Campaigns on Nightmare after Tilshire?

Crap. I cannot get any of my champions up to that kind of attack power. What gear does she have? I have a Skull Crown. Level 46 at the moment on to 50 level. 

It doesn't matter what gear he has his skull crown with.

 what matters is where you're going to use her? Arena? dungeons? farming ? DT?

Gear your champion to what you need not how other people use them.

Your Skullcrown is not lvl 60 anyway yet. You need a campaign farmer that is lvl 60. Kael will do it for now. You can replace him with a champ that does the same job better later on. Kael has low stat and gear requierments for 12.3, the stage is easy with him or any other starter champ at lvl 60.