Yes air unit is easy for normal, but when i try brutal then it was crazy, they come from all direction and hardly defend (i use the cloaked ghost keep sniper broodlord like how people do in youtube but i barely survive until last wave at 99.7% recharge and overrun by them) So i restart and take out air unit and try again, using siege tank defend + banshee kill nydus worm and manage to win in 1 try. Finally completed all brutal..

I found 2 brutal mission is super insane for me where i so frustrated retrying:
1) Engine Of Destruction - So hard to protect stupid Odin drove by damn Tycus, can you just wait a while before you continue push? I hope i can use my SVC to stop you moving, hmm maybe you guy can try build building block him from moving to enemy base?
2) All In - Crazy Kerrigan + Air Unit

Yes air unit is easy for normal, but when i try brutal then it was crazy, they come from all direction and hardly defend (i use the cloaked ghost keep sniper broodlord like how people do in youtube but i barely survive until last wave at 99.7% recharge and overrun by them) So i restart and take out air unit and try again, using siege tank defend + banshee kill nydus worm and manage to win in 1 try. Finally completed all brutal..

I found 2 brutal mission is super insane for me where i so frustrated retrying:
1) Engine Of Destruction - So hard to protect stupid Odin drove by damn Tycus, can you just wait a while before you continue push? I hope i can use my SVC to stop you moving, hmm maybe you guy can try build building block him from moving to enemy base?
2) All In - Crazy Kerrigan + Air Unit

Agreed. One of the hardest achievements. That stupid Tychus deserved his death at the end of the campaign.

Will need to have Science Vessel research prior to this mission. I used 4 Science Vessels + 7 SCVs to keep Odin above 30% all the time.

BTW, nice idea of building structures around him to prevent him from moving. Definitely going to try this later!

eh the 30% only hard mode required. you mean brutal mode got achievement some more?

oh. why need so many la? i only have 3 SCV i think. can't remember got science vessel. one thing for sure i got quite some siege tanks and marines accompanying it. and also vikings and banshees.

when he's resting, you can put your other units in front, or at least you save game when he's resting.

from my experience, the toughest part is the 2nd last part where all the starport is. i lost a lot of units there. the final push not that bad la, spam marine and a few siege tank. got a few BC there.

i done that hard mode challenge without any BC.

i think i recall reading somewhere that only one science vessel can repair one unit at any time, so even if you bring 5 vessels your healing output to odin isn't high.

on the other hand you could theoretically spam scv's and they would all repair him at once.

also, odin has killer ground attack but (relatively) weak air attack.

they're more reliable than pulling SCV around la.

btw i use SV to irridiate the leviathan in Shatter The Sky. was fun.

me got 3

SV doesnt repair, it heals, so it require energy, scv repair need resource, repair is faster, but if you use repair in the middle of a fight, very high chance they are dead b4 u can pull them back. few SV cause 1 SV cant non-stop healing, they need to regen their energy, so few of them will ensure there are enough energy plus, they also healing each other incase something attack them(quite rare cause most units cant attack air). i only use scv repair when it stopped attacking.