Share you build and masteries and we might be able to help... Kael should be managing this on his own.

Kael 60 farms 12-3/6 "brutal" even without all masteries. Probably there is some problem with gears...

Kael 2 pieces of perception and 4 pieces of lifesteal.

If you are doing brutal for first time do not attempt to 3star. use a full team. 

Who  are  you  using  glad  to  help  if  i  can  

You are lacking gear, most likely +16 speed boots/crit gloves.

Certainly get Ninja to 6 stars whenever you can, it is great champion in pretty much all areas.

Post up a pic of your Kael with gear, and of his masteries page, and I'm sure we can help figure it out. :)

please don't laugh, I tryed so many things and wasted so much silver. Now kael gets killed at the beginning. before I made it to the end. I give up..I really took time to figure out how to send a pic. 

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first and all lifesteal set has 4 piece of armor 

if you have some piece of cruel set  too

 Definitely need to finish all masteries with 100% crit rate and attack. Crit damage amulet as well. Make sure he is over 110 speed :)

Lifesteal needs 4 pieces. Mine are coming from beginners "epic" lifesteal set.

+ 2 pieces cruel

The stats of your Kael are terrible. The easiest way to 3* the campaign is, to do it later, when you have better gear. The rewards for 3* all campaign stages are rather low, compared to all the other stuff you get from daily log-in rewards and other sources. There is no reason to waste a ton of energy for trying it now.

Do some dungeons and get better artifacts for your Kael. Try to get gloves with critrate, armor with %atk and boots with speed as mainstat. Don't use gloves, chest or boots with flat bonus to atk, def or hp, artifacts with these stats are junk and should be sold for silver. 

thanks guys...im putting lifesteal 4 of them and 2 cruel and now i'm working on getting materies with just Kael and Ninja is that a good idea? and could someone show me or tell me the best way to set up materies when i do get them. Thanks alot guys.

Skati are you saying no commons, or anything under 4 stars?

Actually I did not say that, I just referred to the main stats of the artifacts. But indeed, you should not use artifacts below 4*, and even they are just placeholders for 6* artifacts. It's possible to get 6* artifacts at Dungeon Stage 13 allready. Ok, it's a very low dropchance at stage 13, but you can get some 5* artifacts here.

But as I wrote allready, the mainstats of the artifacts are important as well. Even a 6* legendary chestplate with flat def as mainstat is junk and should be sold for silver.

4  piece  Lifesteal  gear  +  2  piece  Perception or  Accuracy gear  

Would  be  better  for  you.

Thanks guys I appreciate you taking the time to help me.

You get a very good vampire set from login rewards the first few days. Hopefully you havent sold it. 

These items are scripted to all have crit rate, speed and att% as I recall. Use those items on kael and he shines.

Preferably you could farm lifesteal gear in campaign for a hp% chest piece it will make wonders to his ability to stay alive.

If you managed to get some decent perception gear to suplement that is fantastic. But the two offpieces does not have to be in same set. Stats are more important.

You should aim for a minimum of the follwing.

24k HP

70% crit rate 

140+ Accuracy

170 speed

But as someone else said. You really dont have to beat brutal. The most important is you can farm stage 12.3

After that you have to decide if you want to focus on arena or clan boss because the ideal kael build varies abit. Clan boss you need to focus more on accuracy, defense and hp. In arena focus is more on speed and crit damage and attack.