Since you still haven't finished the mission, I'll just recommend you play back through the entire campaign on casual, either switching to Nydus worms or getting hive mind emulators instead.
If you go nydus worms, siege tanks and banshees are your BFFs. Siege Tanks destroy absolutely everything that's on the ground if you've upgraded them, except Kerrigan. Banshees should be used to take out Nydus worms and Kerrigan. However, don't use all your Banshees against Kerrigan, or try to split them up to attack her on different sides, or one storm takes them all out and you become open to Nydus Worms. Having PFs instead of Perdition turrets helps lots as well, because with a few SCVs behind them, they can tank lots of damage, and you don't have to replace marines. I'd recommend having the attack speed research as well, because surviving longer is good, but killing things before they can do much damage is better. That's all I can remember from my run.
If you go air, use the Hive Mind Emulators to take over brood lords to kill Kerrigan, and basically every Mutalisk that comes your way. You become unstoppable with an army that size.
Tl;dr: Ground version, upgrade Siege tanks, Banshees, get PF.
Air version, lots of Hive Mind emulators, GG Kerrigan.
I have finished the mission, I beat the entire campaign on casual, then clicked play again on Normal, then Hard, then Brutal!, I never moved on to the next mission until it was completed on brutal. I got aces high Achievement just before I tried on Brutal, but the Strategies I used on Casual/Normal Did not work for Hard since i needed to get Aces High. The Strategy I used on hard don't work enough on Brutal (read the first post for the strategies I used). So why the hell restart and play it on Casual just to get the last achievement when they worked thus far? I love how people give recommendation about what I should of done or what I should redo, but they cant give advice on what to currently do. Thank you for the input though, it does help.
try this...make sure you go ground....and no you don't have to follow *everything* this guy does but as an intelligent being you should be able to extrapolate a solution to your problem.
Already done that, for hard mode. Didn't work, thanks though
Start with moving your BC's to the back of your base, just behind the mineral line. There will always be a broodlord or two every now that then that can be dispatched via Yamatos. Build a ton of turrets at the artifact, and leave the bunkers there. I sometimes build one ore two more bunkers.
Pull all your ground units behind the artifact (low ground) build two psi disrupters on the low ground but behind your ramps (toward your CC). Line the area there with about 10-12 tanks as someone already suggested.
Build marines and a few medics to deal with Kerriga while you spam vikings.
When Leviathan comes, you can lure him with your vikings to your turret wall near the artifact. Don't clump the vikings up because they will get mass funguls. Use 3-4 and lure it to your turrets and then finish him off with your vikings while your turrets take the beating.
Don't forget to put turrets up behind your mineral line to take care of small groups of mutas that may attack your pair of BCs. You can also put 3-4 vikings back there on standby and they should be fine with their biosteel.
The BC idea I haven't tried, as for the rest, Yep did all of that, the levi somehow manages to kill my Viking so I think the clumping is what the issue was there. Medics and marines are kinda useless since she one shots the marines. as for the viking in the back, yeah did that and never needed the BC's 4 Viking handed the back the entire time no prob.
Man, you got like the worst research upgrades. Artosis has similar ones and it took him forever to beat all-in air on brutal, and he's a masters player. Then again, artosis was trying to play the game like it was multiplayer (e.g, not abusing campaign-only units).
Also, you got the psi-disruptor and chose to fight air? :s
All I can say is good luck... I'm playing brutal right now and I'm trying to gear EVERYTHING towards what I need to beat all-in.
Thanks for letting me know its going to be hard... oO?
just play the while campaign on casual, just make the basic upgrade on dics rines and tanks. and save b4 get into char. Then upgrade armory and lab according on what u going to do all in air ¿hive mind? or nydus ¿mass tanks and slow zerg shiit
wha? Oo? Re-read my post